Wiring basically comes down to making sure every Input is connected to an Output. (Hopefully the image makes it pretty clear)
The debug loadouts are actually going to be available from the shop in normal (non-debug) gameplay and cover all their own wiring needs EXCEPT the wires connected to the reactor because of how the reactor upgrades in normal gameplay (by defeating story bosses). I should probably add somthing to the UI to indicate obsolete loadouts since there'd be no way to go back to them normally.
For falling through the world, I'm guessing you might've started a match without the Basic Movement ability active (maybe with the right modules, but them unpowered) which spawns you in ragdoll (intended) and the map loaded in ontop of the ragdoll without accounting for it, clipping you through the floor (unintended).