Vehicular load bearing walls are a bit more involved. Problems with this type of wall are lack of supporting soils, poor toe conditions, minimal buffer area, plus add in water infiltration and limited budget.
I would rather work in a river than do this kind of work
People seem to think that it's just a driveway and don't think of the loads that it carries or stress that can be put on it.
Since your limited to V-lock walls, I would plan on excavating 9' back, I would use a bi-laterial geogrid, back filled with angular 3/4" washed gravel. Use a hard PVC pipe for your drains add a clean out or two if you have room. I don't know the roof structure but check which way down spouts are running by the garage and pick them up with a separate PVC pipe. Don't plan on using your small plate compactor to compact the back fill, rent a large plate from the local rental yard. As you finish the wall look to see how the water is going to run off the drive, try to keep it away from the wall.
Lastly find out if you can put some type of guard rail up to protect yourself from having someone drive over the edge, or if you have room install a buffer area, 3' to 4' should be enough.