Leg platforms are annoying as hell for actual real gaming, you'll end up just leaving it at home if you get one.
I'll echo what the above guys said and definitely say that you should avoid ACM rigs/vests/carriers/pouches/etc at all costs. They are terrible and not only do they fall apart after a few games but any metal parts like buttons and fasteners will rust, snap, crack and generally fall apart faster than you can say MOLLE.
Personally, I recommend you start with something like this Condor rig:
And one of these triple pouches:
And you're off to the races. Much less expensive, lightweight, and durable enough for the beginner. Condor is the minimum step above ACM
that you should be considering if your budget is tight.