Need to make a service drop from electric co. service drop to main house. has 100amp panel want to make additional drop, to detached garage . will install 30/40amp sub-panel in garage, has only a 20A single pole Hot/Nuetral only currently supplying the garage now. have 110volt 10foot box freezer 3ea flouresint fixtures, 1/2 hp. chain driven door opener with incadescent 60watt bulb, also acouple plug recepticles. To much current also no ground for all the formentioned. Want to correct situation, upgrade please advise? As to the necessary wires or cable and insulators needed to go from existing roof service drop with parallel series service drop to my garage roof??