Getting yourself a teacher seems to be the very best choice!If you cannot find one or afford one, there are online courses and self-study material (books + DVD/CD) that are pretty good. There is a risk that you get "trapped" in bad technique, even injury yourself, if you don't get help. Bad habits are terribly bad to get rid of.
https://www.pianopractice.org/book.pdf
Besides study with a teacher, at least get an introductory method book and go through it from the beginning. Put your fingers where it tells you to, use different fingers on the same key when it tells you to, cross your thumb under your fingers when it tells you to, and so on. I'm not saying that's as good as a teacher, but it will at least show you some ways to make up for the deficiency of only having five fingers on each hand.