The lift kit you get should come with most stuff you need already. The exact kit you choose will determine what else you may need and the directions should say.
I'd stay away from Rough Country's 3.5 inch lift as it is very hard on your suspension angles and geometry. My favorite is the CST 4 inch lift, but it is extremely pricey. the Rough Country 5 inch lift is actually pretty well built from what I've seen, as is Rancho's lift.
There are others out there too. Basically you don't want a lift that is basically a stretched out level kit like the RC 3.5 inch lift. That just tears up your ball joints and stuff.