I can build you one that has Linux ready to go. That’s literally what I do, IRL. I build custom PCs for university students and professors, foster dogs, and grow marijuana. The real issue is that I cannot recommend any particular distro over another. I personally would suggest Linux Mint for most users, but if you are using your computer for more high end stuff, like 3d rendering, AutoCAD, or AAA gaming, there are other distros that are more finely tuned for those purposes.

Try out mint. Throw it on an older machine and use it instead of your daily driver. When you encounter issues, just ask in c/Linux. Most of us are friendly and will help even the newbiest of newbs, because we were all there once as well.

After a few months, you should feel comfortable enough to either totally nuke windows, (how I did it because I am lazy,) or set up a dual boot partition on your drive so that you can choose to boot into windows if you really need to do so. Warning. Windows will overwrite your boot sector every single time it updates, killing the ability to dual boot until you fix the sector.