QuantumAlchemist

Hello, everyone! I have been a longtime fan of OverClocked Remix and its community of musicians, but I have reached a point where I very much now want to start participating. I have no formal musical training, but I just ordered a Yamaha P105B Digital Piano Keyboard with the intention of learning how to play it. Any friendly advice for newbies in regards to this? Another semi-related question: Is there a list of of video game music piano arrangements that are relatively good pieces for beginners? Thank you in advance!