in my opinion 1 not every company makes every gun so it kinda depends on which gun you want.
2 better to have one pistol and a free hand to change mags
3 weird and cumbersome but in most games not illegal
4 camo in woods , anything not red anywhere else
5 depends on the particular game, most games have a re spawn
6 mostly friendly
7 usually you can register ,show up and play, most teams are invite only