Just like these guys said make sure if your going to invest in a gun make sure its a quality AEG. Get age verified so you can see a better selection of guns that won't bust the first time you use it on the field. You don't want to end up spending a whole load of money just to keep the gun in the game. Just do your research for brands here that are reputable and read the reviews before you decide (CA, TM, RS, G&P, Ares, VFC) . In the meantime you may just want to rent as stated above.
Make sure you visit the FAQ section and read all the major posts. http://www.airsoftcanada.com/showthread.php?t=58784http://www.airsoftcanada.com/showthread.php?t=72497