Before you start upgrading, you need to decide what you are going to use the truck for. Street performance, competition performance, and work performance require different approaches.
If you don't have them already, get gauges before you start anything. Boost, Pyro (EGT), and a trans temp. And keep a record of what you did and the result. Do 1 change at a time. Trust me, it will save you a lot of trouble undoing a change you weren't happy with.