Advice on jacking a truck up?

I have a 2004 Dodge Ram 1500 Quad Cab and I was thinking about lifting my truck up a bit. I am totally new to this and I have no clue the differences between suspensions, lifts, and what not. Which is the one you see on most trucks which are lifted up just a little higher, but not freakishly high? Also, how much will this cost?