Hey there, mate. There's a post explaining the ret mechanics thoroughly on Elitist Jerks
here which you should take the time to read. It will answer your questions. After this if you have any more, reply to this thread for more.
As for our attacks the only ones that are spells are Exorcism and Consecration and Judgment is considered a melee attack. And they scale both off spell power and attack power(poorly from both though). Also strength increases the damage of our melee strikes, CS and DS.
Anyway, give that post a good read and return here with any more questions you have.
Gl!