Well, directly mining BTC isn’t going to happen with graphics cards. You would need ASIC’s to really do that. Granted, you can get paid in BTC for mining. The simplest option would be to use a service like NiceHash, where you rent out your mining power to them and are paid in BTC.
Alternatively, you could directly mine coins, then exchange them for BTC, Eth, or whatever other coin you want to hodl, through exchanges. You would first need to pick what coin you want to mine, then download mining software for that coin to your rig.
Nvidia cards are typically less efficient right now at directly mining Etherium than AMD cards, and have higher profitability on RavenCoin from what I have heard. You can use whattomine’s calculator to get some ideas about what coins would be the most profitable for your set-up.
Each miner is a little different, but should have directions about how to configure them. You may also want to consider mining as part of a pool, rather than solo mining. This essentially combines the mining power of multiple users, and you get a share of any rewards found - which typically leads to more reliable income over time. Less exciting than actually finding a block yourself, but that is a matter of luck and can take quite some time.
Hmm, other general suggestions, go to the official coin site to find links for the mining software. Links from major pools are also typically reliable. Once you settle on a coin, there’s probably advice on their Discord sever or forum about optimizing mining for it. That’s what I can think of off the top of my head If you have specific questions, feel free to ask.
Editing in a P.S., you should first figure out your electricity rate. You’ll need to plug that into to figure out if mining would be profitable for you, and by how much.