I haven't found a wiki, but you need to build an exo modder to work the suit. The mods are mostly universal I BELIEVE, but the wall jumpers and the shoulder piston require a boot or chest piece, respectively. The buoyant barrel makes you fly up to the surface when you press the key you bound it to. The cobblestone drive creates 1 cobble per 1-2 seconds (relatively slow). Both can function on a pair of pants, and they should work on the other bits of armor.
The exo modder will have one slot at first, you place the armour in that slot. Other slots will open for you once the armour is in place. There are two buttons that will show up when the upgrade is put in the slot. The bottom button will change the key binding for activating the upgrade, and the top button will change how it responds to the button (toggle, only on when pushed, only off when pushed, etc.)
That's about all I know about the exos, hope it helps