Looks like a good template to start. Look at some lightweight wheels as well like some SSR's or 5zigen FN01RC's or some other name brand ones like work, advan etc
Intake mani is overkill for your setup, if you insist on a tb, port match it to your current intake manifold. Header and exhaust should happen. Megan is a well priced header that is pretty good quality
Just gave a couple opinions in bold above^
In terms of your idle issue, check your iacv to make sure it's clean as well as your fuel filter, those are usually the culprit.
Aside from that, good luck and keep us updated :thumbs up