[Jayhad]

1 no, read the reviews sections. The 2 brands you selected are of great quality. Google is an amazing tool

2, you don't. there will always be some one on the field with more money, more experience, add a bit of minor upgrades and you can be more accurate, IE a tightbore barrel

3 effect range of AEGs that is a real subjective question, do you want to hit a body target or something smaller. I figure with my AUG I can be very confident with hitting body targets at 40-50 metres but there are other users here who have done real good tests on this.

4. Stock weapons are great, you need to decide if most of your play will be indoor or outdoor, many indoor arenas have FPS limits of 300+/- no point in upgrading your gun if you just want to play inside.
When I started some wise Vets told me don't upgrade your gun yet get a season under your belt first, you may very well not want to use the weapon you first purchased

5. Yes you can get metal kits for a wide range of guns, no the plastic isn't bad but the metal feels so much more 1337.

6. get gas you will disappointed with and electic or spring pistol.

7. Masks are for paintballers, which is GHEY. unlike your markers you can't rest a butt stock against your cheek with a bright yellow plastic mask on.
Some fields require masks/ goggles. you will also start to notice that many of us just wear tactical shooting glasses (aslong as they are ballistic rated like ESS's)

No a question for you are you over 18? if not you are swimming in a shark infested shit canal and you just cut yourself.... good luck