Adobe Photoshop help??

i just got adope photoshop im a skin maker for bebo.com and i have no clue wat to do i now how to make skins but i dont noe much about it if any1 has tips on how to use it please tell me ??? also i tried to upload great skins but there to big dose any1 now a way to make the files smaller without deleting much and if u now how to make moving thigs tell me please thnx best answer comig som1s way ps its adobe photosho cs2