I know guys who drift at night and do well sometimes. I prefer to anchor but if the bite is slow I'll put the trolling motor down. I've never used spot-lock, but I won't say not to use it. The lights, just use whatever you are comfortable with. I fish water 20-30 ft deep at night, sometimes I'll set up beside a brush pile, sometimes a drop-off. Only a lake I'm not very familiar with would I fish a bridge, too many other boats there plus I don't like being that close to the concrete posts. Different lakes usually makes fishing depth challenging. I fish High Rock Lake NC most of the time and I'll fish lines 10, 12, and 15 ft deep. It's not unusual to catch fish less than 10 ft deep. Lake Norman and Wylie I very seldom catch a fish 10 feet down and the deeper I fish the better. As far as a rig, I just use split shot( not sure what size) just over a hook. I also use corks on some rods, part of that is for light bites and entertainment! Hope this helps!