If you have no idea as to the answers to all these questions, I'd say stick to the basic bolt-on lift kits for now until you learn a lot more about your truck and how to modify it, why those modifications are wanted/needed, and the possible pros/cons of each mod.
Suspension, steering and shocks are all pretty broad subjects on their own. You'll probably get a better response to very specific questions instead opening this big can of worms.
Learn to use the search feature at the top of the page and do lots of research there too.
Good luck! <IMG SRC="smilies/smile.gif" border="0">