I'm not great at it or anything, but my best friend is, so she helped me out and taught me a few things. Figuring out skin tone and colors is not my forte. I experimented a bit. There are YouTube videos for many different looks, though. They'll tell you which products to use, brushes, techniques, etc. and walk you through it. You can also go to a make up counter and ask them for tips/recommendations.
Well the first time I put any make up on was sophomore year so I was 15. It was just eyeliner, then junior year I put just mascara and then senior year I added eyeshadow but that's about as crazy as I got in high school. Learned by myself then after high school mostly tips from YouTube channels but I don't really put on foundation or any of that its mainly mascara, blush, and sometimes eyeshadow and eyeliner. I'm light on the make up. No lipstick for me, I just don't like it on me.
Redheads' look best in peachy or soft pink blushes, berry/peachy/soft pink lips, brown eyeliner and mascara, and dark green, silver, creme, brown, burnt plum and rose gold eye shadows depending on your eye color.