Amos list is good follow it. its a good way to keep it simple which is the best place to start. Also when the age verification comes through try to get a stock gun that way you aren't paying for upgrades to a gun that you might not like. And when you have played with the gun for abit then you can add stuff like silencers, scopes and bipods if that's what you want to do.
Also check out
www.airsoftparts.ca which should have everything you are looking for and has top notch service.