Garage electrical

My neighbor came over and offered to rewire my garage with a friend visiting from Africa. His friend wants to learn everything he can so I guess they decided my garage was a good candidate.  I know he is familar with the inadequacies of the garage, as the previous owner and he were friends. And the previous owner was very creative with home repairs.  After I bought the house, he told me he had cut electrical lines in the yard to the pond and all outside lighting because he knew they would not pass inspection. 
All  I need is to get an electrician out to find out how it is powered --where the lines are buried from the house and update that-- and he will do the rest.
Neighbors are good.

Hydrangea outside my front door. This is the first it has bloomed in a couple years. Previously we would have a cold snap at an inopportune time and freeze all the wee blooms off. Not this year!