"miscellaneous tools (any specific tools I need?)"

Get some screw drivers to fit fit every screw on your airplane, engine, and radio equipment.

Get allen wrenches for the same thing (wheel collars, engine mufflers, something for everything!)

Some small self-tapping screws are always good...

Get some packing tape or scotch tape in there for easy patches at the field.

It never hurts to keep some CA in there too!