No worries, its always best to describe what you have to get it out of the way and people know. lol
With all the kits out there for LS swaps they are pretty much bolt in. Wiring it is were the issues start. LSx engines are super plentiful as they where used in the trucks as 4.8, 5.3, and 6.0L. These have iron blocks and later models have great numbers to start but the closer to the current year the more you will spend on an engine.
As a beginner, IMO I would suggest reading up on engine building, both small block and LS engines. There are numerous books on each. Believe or not, engine building is very easy if you go by the book (so to speak). Make sure you have the specialized tools 1st though. i.e. torque wrench, gear puller, etc.
Research is key with anything you do with these trucks. (and you thought you were done with homework) It will pay off in the end though.