Weapon
G&G CM ARs - good rep
CYMA ARs - horrible rep
ARES in general - horrible rep, accurate externals
Clothing
Sounds good
Boots
Would use the camping boots until you get into airsoft
Webbing
Since you probably run highcap in the beginning. I'd wait with the webbing, you can ask to try some other peoples at the games to see what fits and ask what similar sized people use. I am about 6'4, I think waist 38-40 and I run chestrig, but never had any size issues with any webbing.
Face cover
I run cheap plastic from DIY store/building merchants.. not bothered what covers my mouth, as it stops bbs from knocking my teeth out and doesn't steam up up my goggles. advantage with two part is that you can remove lower face (if you're over 18) between games but when not in safe zone.
and yea.. you forgot kneepads.
I'd get some straight away, you only get one pair knees and busting them sucks. and kneeling for longer periods without them also sucks.
Two tone VS rental
You're of course free to do as you want to. But here is my advise, and it specially applies to G&G CM16. If you buy a two tone, you will get to use a brand new AEG rather than a busted rental until you got your UKARA. and the loss of selling it 2nd hand/replacing twotone parts/removing two tone paint/repainting it will be less than what you've spent on rental.