Hi and welcome
There's tons and tons of information available on these forums; I suggest you take a few days to read lits and lots first, as you'll find most of your questions have already been asked and answered, probably tens of times, already.
That being said, you'll find out that Canadian Tire and Walmart stuff are usually frown upon, and considered to be the lowest crap you can get (because they are). But hey, you didn't know better don't you?
Airsoft is an expensive hobby. A good entry gun will run you 250-350$, and you'll have to add good battery, charger, good eye protections, boots, magazines, probably a vest with some mag pouches at least, etc.
Also, acquisition and selling of airsoft guns is "reserved" to 18+, for legal purposes. If you are not of age yet, you'll have to wait patiently and take that opportunity to read and understand more about the sport, and also stack some cash.
Originally Posted by Brian McIlmoyle
Real life comparison,
GBBR- bang bang -- Giggle
AEG-- merrrzip merrzip -- meh