Whatever training you have now and before the 135 op won't satisfy the
FAA. They will want more training of a specific type. Also, your
biggest problem is going to be finding an IA that will do 135
maintenance. The FAA's main concern is going to be your aircraft
maintenance. It is easier if you buy a new plane or a used plane
already under 135 maintenance, but ask around of the local IA's. That
is your biggest bottleneck, aircraft maintenance.