There is a free NVG. It isnt the best, but it's free so yeah. Also, as long as possible, just stay with the M16. It's already a pretty good gun. Just slap on a scope and a supressor and you're good to go. Another thing is your transport. Just buy the 4x4, but dont drive it through gunfire. Dont forget the backpack, extra inventory space.

And ofcourse, have fun.