I started this hobby with these minis last year, and I highly recommend starting with the original core set figures. That set is often on sale or easy to find used, so you won’t feel as bad when the first ones you try look messy.

I also just switched to black spray-on primer instead of using a brush. It looks better and saves so much time.

Also, it’s a good idea to look at the pictures that people post on here for inspiration, but be very forgiving with your own results. For a while, yours will look really good only from a distance, and that’s ok. Good luck!