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A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
i just left lowes an they told me to run 100 amp to my building i would need wire size 2-2-2-4 alumninum and run it in conduit the lowes around here does not sell copper wire that size
The size breaker you use is determined by the size wire used in the circuit. If you use AWG #12/2 wire then use a 20 amp breaker. If you use AWG # 14/2 then use a 15 amp breaker.
Use a 20 amp fuse or breaker.