First you need to know your scales. All of them, white and black keys. Then, look to the left of the first line of the first page (key signature). Look at how many sharp/natural signs there are. If...
Definitely look into anything by Yann Tiersen. He is a French composer and wrote all the music for the movie Amelie. His music is beautiful and is also fairly easy to play. Comptine d'Un Autre Ete is...
First, one must secure use of a piano. Then one needs to take lessons to learn to play the piano, and must practice, practice, and practice. When done practicing, they need to practice more.