Insulation, there are three grades of fiberglass.
For a 3 1/2" void, the highest grade is an R15 special order.
I bypassed that in my garage conversion and got ISO foam sprayed in 3 1/2" thick at 7 R per inch. Total 24.5R. The spray foam not only controls the temp but knocks down on the outside noise and blocks the bugs.
Cut in your HVAC ducts first. Also in the South West market they have some really high R value flex ducting available.
Consider drilling and treating the concrete floor for termites b/4 the floor goes in.
For your laminate floor, lay down some 6 mil poly cloth first with about a 10" over lap and tape the seams and run it 6" up the wall. Concrete floors on grade can be moist.
