I wouldn't bother with a Glock trenching tool; they are needlessly expensive and function no better than a short shovel from the hardware store costing much less - there was an extensive thread on shovels for cars not too long ago.

Get lithium batteries for any lights you will leave in the car. They will hold their power much better than alkalines and won't leak.

Do you have the owner'smanual for your car? That is a good starting point for both repairs and tools you will need. The manual will also tell what fuses to get.