What do I need to start making my own press on sets?

Hey y'all! I'm a complete newbie when it comes to most nail stuff, and have stuck to regular polish most of the time. However, I really want to start getting into gel because I'm a huge fan of nail art and I like that gel gives me the opportunity to really take my time. The only problem for me is that I don't want to use my actual nails to practice (UV exposure+removing polish from nails can take a whileeee) so I want to use press ons that I can design/paint before I transfer them to my nails. I'm not sure how to find nails that aren't just loose—I would like them to be attached to something so I can paint them without having to worry about them moving around. What should I be looking for online for this? I'm not really sure where to start... thank you!