Hey man just spend a bit of time looking through google and these forums, input your own preferences, such as the type of thing you'd prefer and check out all the sites you come across. (as a starter I'd STRONGLY recommend an electric rifle or "AEG" over a gas one to begin with).
For a lower budget I'd personally recommend TiwanGun.com but remember if you don't have a UKARA (again, search it on here and research it) make sure you get a TWO-TONE gun, or customs will have it!
The other bit of confusion you'll run into is batteries....
There's a LOAD of stuff on batteries on these forums and around google etc. but to summarise from my limited knowledge, but not so limited experience, I'd say:
1. Get a LiPO battery and NOT a NimH
2. Get a "Smart charger"
3. The bigger the "MAH" number is for the battery, generally - the longer it will last before it needs recharging
4.The smaller the physical dimensions of the battery (it's height, width and depth), the better - it's more likely to fit in your rifle if it's smaller - obviously.
5. Voltage - this can get really technical based on your rifle, generally a better, or more expensive rifle(RIF) will be able to handle a higher voltage of LiPO battery (without getting into details about MOSFET etc.) - 7.4v is what you should aim for with a budget gun.
--To summarise on batteries: Get the smallest 7.4v battery you can with the highest MAH number, and definitely a smart charger.
AAAAAAAAAAND finally:
DO NOT BUY CHEAP EYE PROTECTION, and a good pair of boots will go a long, long, long way. Literally.
