Here's how I used the buttons on the one I had for awhile (I dont remember what the #'s are, so you'll have to do with description by location lol).
Trigger fired just main guns.
Two buttons on right side of stick (one up one down) were flaps. Two buttons on left side of stick (one up one down) were Fire Secondary (bottom button) and Toggle Secondary Weapons (top). Buttons on base were Chk 6 and WEP.
I feel your pain not having a decent store to go to, but internet shopping is the way to go man. You can find much better deals on stuff than in a box store, many of the chains even have online only items and prices. Seriously, use that thing while you save some money and then kick it as hard and as far as you can.