I think you're asking for advice, so here's mine on makeup: practice makes perfect.
It is an art, like sketching, painting, or anything else. Even if you find a good tutorial, you're still going to need to practice. Part of your learning process may include an afternoon where you apply makeup, wipe it off, and apply a few more times so that you can really hone in on some things.
Don't be afraid of cheap makeup, especially while you're learning. Once you know what works for you, then you may decide you want to get some fancier products.