Airsoft is mostly fun if you can get a group to get intersted. Its cool to have a replica that actually fires and all, but some ppl get bored if they can't shoot more than cans. It can also get pretty expensive (as with all hobbies) if you really get into it. If you like tinkering with stuff then it might be for u.
Some sites:
SquadX
arnies airsoft
Airsoft seems to be pretty damn popular in the UK and such, but is slowly getting more and more popular in the US, which perfers paintball for whatever reason. (which is way more expensive, as air and paint usualy cost $80 per game). With airsoft and a electric rifle (AEG-automatic electric gun) u really only have to buy bbs, about $20 for 5000. Most AEGs are made by Tokyo Marui, u really can't go wrong with those. They are about $300 per rifle. They have many MP5, M4, AUG, G3 variants. They all perform about the same, about 300fps. Get your most favorate looking gun. If you want more power u have to upgrade yourself, which would usually cost about $100-$200. These usally all come from Japan, which increases the price, but exchange rates are pretty good now so its not too bad.
Most ppl order from HK shops online. There are also domestic shops too, but generally expensive. Some good domestic one are
atlantaairsoft, and airsoft128 (don't know how good they are, but pretty cheap and they ebay a lot).
I like to collect pistols also. There are tons and they are all gas. They have electic pistols but they suck. Generally pistols are for display and sidearm. You get about 25-50 shots and u have to buy gas ( i usualy just buy sams club air duster gas). Just post more questions if you have any!