You can always dual-boot, i.e. have both Windows and Linux... or multiple Linux installations, if you please.

Start with Linux Mint for greater stability and familiarity. Soon enough you'll learn that distributions are basically fancy pre-packaged collections and configurations of mostly the same applications (they're also called packaged), which should make choosing your distribution a bit easier. There are differences, of course, but you'll need a deeper knowledge and more of a nuanced list of requirements before it starts to matter much, so don't stress about comparing them and choosing "the best" for you - you'll always be able to switch the entire distribution or reconfigure your own to fit your specific needs surprisingly easily.