That Blackhawk vest can take 1 AK mag in each pouch.
Unless you plan to wear a SWAT loadout all the time, you should reconsider another color that is more adaptable to outdoor and indoor games. OD or Coyote Brown (Kahaki) are very good to start with.
Choosing a vest with PALS webbing can give you better flexibility in deciding what mags and pouches you need for each specific game. Look for MOLLE pouches. They are design to fit onto PALS webbing.
I've shopped at
http://www.optactical.com and they are pretty good in prices and delivery times. Uniforms and boots can be purchase at the local Surplus shops on St. Laurent boul. but your kit should be from online retailers. They have a better selection.