It uses TN panel.
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Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.
The service distribution needs to have a disconnect from the utility supply. Most homes use a combination distribution panel. If the home owner wants to have a load center installed then there has to be a fused disconnect ahead of the panel. The less costly of the two options is the combination panel. Labour costs drive the load center, main service switch option much higher because there are more materials to assemble.
A 100-A sub-panel would be fed from a 100-A breaker.
I would install a 60 amp sub-panel and use AWG #3 copper.
Use #10 copper.