Serial key bfme2 patch 1 07 firefox

My pc is from I think 2008 when Starcraft 2 came out. It hates me when I play Civ 5 or run more than 5 firefox tabs. I don't need a whole lot I don't think, I have a 10tb external HDD housing the media I do have, but wouldn't mind having a little extra to use that as a pure backup, Already running two monitors and not lusting after anything like 4k or even huge 1080p graphic games.
On PC I enjoy RTS games, old school like BFME2 and Starcraft 2, not online even. Use it for some schooling but nothing like CAD or extensive necessary programs. I'm a law student and just typing up awful arguments. Pretty sure i'd be able to put together everything no problem.
I guess my biggest wants are it not sounding like an aircraft carrier, maybe being able to give out 1-2 streams for my plex set up and having more HDD space to futureproof that, wont be sending out 4k streams.
Just not sure even what I should be look for or even if I should be building and not just finding a prebuilt system. I just enjoy sitting at a desktop.
Thanks.
Edit; was lookiing at something like this: https://pcpartpicker.com/guide/G4V323/modest-amd-gaming-build
But even that idk if it's over what I need or like, I'm not gonna overclock. So I mean yeah if I can save money (or even get a cheaper specific build and have someone do it for me dope)
Further edit cause, I am browsing. I'd be interested in like a decent VR build, but its not what im gonna go broke over either. Have the PSVR and it barely gets use, but obviously I know PC is way expanded in terms of usage.
Last edit: (LOL nevermind on VR)

 What will you be doing with this PC? Be as specific as possible, and include specific games or programs you will be using. 

Majority will be Plex server personal use, some future proof of having 1-2 external streaming from it (so far have just been updating my sister with a external HDD but want to expand eventually).
Gaming isn't much. VR and actually going ham with like emulation and everything is a nice fantasy, but really i just don't play like i used to. Probably will stick console, but would like to be able to play like Civilization without my tower sounding like an aircraft carrier. Everything else is just class and work stuff, which is mainly office. Would like Firefox to not go also aircraft carrier if I have more than 5 tabs open (Trying to get into D&D GM stuff and planning a LotR 4th age campaign. Lots of unnecessary research because no one cares about every NPC's lineage to Elronds.)

What is your maximum budget before rebates/shipping/taxes? 

Would really like to stay under 1200 USD. I have two monitors already, but I know I'm also not asking for a ton either. Mainly want to just kind of future proof the plex stuff. Have a 10TB external i'm using right now.

When do you plan on building/buying the PC? Note: beyond a week or two from today means any build you receive will be out of date when you want to buy. 

Ready to begin now.

What, exactly, do you need included in the budget? (ToweOS/monitokeyboard/mouse/etc) 

No monitor, Tower is all that's necessary. But using amazonbasic mouse and keyboard currently. Upgrade recommendations welcome and will be put in commission. Don't need customizable backlit keyboards though.

Which country (and state/province) will you be purchasing the parts in? If you're in US, do you have access to a Microcenter location? 

US/MI. Not with the covid nonsense.

If reusing any parts (including monitor(s)/keyboard/mouse/etc), what parts will you be reusing? Brands and models are appreciated. 

Currently using amazonbasics keyboard and mouse, happy to take recommendations to upgrade. Otherwise only thing I think reusable would be a WD 10TB external, not the passport; the dedicated powersource type.

Will you be overclocking? If yes, are you interested in overclocking right away, or down the line? CPU and/or GPU? 

Is that like winding up a pocketwatch? None of that sadly.

Are there any specific features or items you want/need in the build? (ex: SSD, large amount of storage or a RAID setup, CUDA or OpenCL support, etc) 

Again my biggest thing is i'm running a prebuilt one from bestbuy I got because I needed to play Wings of Liberty when it came out. More into a plex/home theater build now with some maybe external streaming shares. Do want to give Ghandi his nuclear option with Civ6, but RTS sadly seems to be a dying breed.
Optical drive would be nice, occasionally to burn a DVD for my nephews in the car.

What type of network connectivity do you need? (Wired and/or WiFi) If WiFi is needed and you would like to find the fastest match for your wireless router, please list any specifics. 

Have been wired, but have a USB wireless adapter.

Do you have any specific case preferences (Size like ITX/microATX/mid-towefull-tower, styles, colors, window or not, LED lighting, etc), or a particular color theme preference for the components? 

It can be the most boring corporate case that looks like what Lumbergh would use in Office Space. Dont need colors, just want it to stay cooled, but happy to pay extra for it to be more quiet as well as my desktop is set up by my console chair

Do you need a copy of Windows included in the budget? If you do need one included, do you have a preference? 

Windows 10 installed please, home is more than enough.

Extra info or particulars: 

Any follow ups please don't expect a lot. I'm pretty tech savvy, but also I haven't opened a case since upgrading from like 56k life. I know some, but I'm here cause the "Ryzen 7 overclocking 12GB 1440p" stuff has overwhelmed me into delaying this upgrade so long my workhorse is struggling when it restarts and needs a couple power cycles to finally find its motivation.
My girl has put me through a bachelors, masters, the Kerrigan SC 2 campaign (the protoss one just looked so bad... on second thought tho, it would be nice to finish it. My boy Raynor deserves closure), several replays of BFME2 and Red Alert 2 and even a week when my phone died and I had to emulate an android phone on Nox (we got really close to an of mice and men situation that time).
She deserves to retire to my not smart tv in the unused living room until its time. I don't want to Old Yeller her. I know it's not a flashy build, but if I see another amazon or best buy listing with rainbow colors and not listed/named parts, I'm afraid this old girl will try and cash in on my homeowner fire policy.