Figure out what you intend to power, and figure out the maximum amount of power you need.
Run one circuit from the house to a subpanel in the garage. Our outbuildings are powered off a 40A 220V supply, to give you an idea.
In the garage, install branch circuits for lights, outlets, etc. This will allow for futureproofing as if you want 4 circuits in the garage, you don't need to run 4 circuits from the house. Also you will have 120/240V just like in the house. (Our garage has a 120V circuit for lights, 2 120V outlet circuits, and 1 240V circuit for the air compresor) It is safer as well as one breaker kills the garage completely. Home Depot sells a nice little Square-D sub-panel for $20 that I have used many times in our outbuildings.
While this may be simply described here, it is actually a big job. Consult an electrician if you are unsure, especially for the high current feed to your subpanel.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.
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