Our unit SOP only applies to the IFAK, and it has to be placed where you could reach it with either arm. We do a lot of dismounted patrols, so a lot of guys put it on their "strong side" and use is as a bit of a rest as they hump through the beautiful Afghan landscapes! As far as the other gear, a lot of it depends on your position/job within the squad/platoon, as gunners in turrets (double stacks of M4 mags will hang up on the lip of the turret, as will your camelback, for example) will have a different set up than SAW gunners, M203 guys, docs, etc, etc.
Once you get all your Molle issued, set it up as your unit will prescribe (sometimes they will dictate the entire set up, some, like my unit, only partially) get some magazines and load them into your pouches, and get in the prone position. This will generally change a lot of minds when 1) you try to get prone on the range, or 2) try to get prone and reload under fire. As SFC Kempf said, get with your leadership for assistance.
Oh, if you are "fortunate" enough to be issued the "TAP" system, just leave it in the bag. It's a total pain and constantly needs adjusting and tightening. Just sayin'...
Former Marine MP/CID 83-93
GAARNG '06-Present 31B4
Desert Storm 90-91
OIF 08 OEF 11-12