100 Amp Subpanel In Detached Garage

I want to add a panel to my attached garage what size breaker do i need.
100 amp subpanel in detached garage. Looking for the right size wire for your 100 amp sub panel for a detached building garage or shed. I was thinking of using a 60 amp breaker and installing a 100 amp panel in the garage in case. How to ground a subpanel in a detached building or garage. 1 3 thhn thwn 2 wire for 100 amp sub panel.
The garage is detached and the tenant is still deciding on ac heat options. Installing a sub panel for a garage electrical question. Single conductor 3 gauge thhn. Run the conduit from the garage to the main panel box.
I have 200 amp service to my home at an outside panel that feeds into the home. Use 1 1 4 inch pvc conduit for a 100 amp sub panel or 1 inch pvc conduit if the sub panel is 50 amps or less. I currently have power ran out to my garage however it only runs 2 lights and the wiring is old. The 100 amp subpanel does not appear to have a grounding bus.
I can t run the power feed from the meter it s going to have to come from the main panel inside the existing house. At current no pun i only plan on only running a drill and a rotary hand saw neither at the same time. Dan asks if i run a 120 volt ac feeder from the main service panel 30 amps to a subpanel in a garage do i need to carry the ground wire in the feeder cable to the subpanel ground which is required to be attached to a ground rod at the garage. Sub panel in an attached garage electrical question.
Dig an 18 inch deep trench for the outdoor electrical wire which you will run from the main panel box to the garage sub panel.