Basically the notes you'll mainly encounter on the piano is A,B,C,D,E,F and G. But in reading them in the notes and the piano is different. These piano notes can either be a flat and a sharp notes....
Piano music is written 1 whole step below clarinet music. So if the note is a Eb on the piano it's an F on the clarinet. If it's a G on the piano it's an A on the clarinet.