Startup
If you are starting an operation in the USA, you will need to go to the FAA website and go to the advisory circulars under Part 135. There is an AC on how to start an 135 operation. There are several different levels of operator. For the majority there is no need for a maintenance manual. For some you will not need a training manual. In fact for the simplest form, a single pilot operator, you will not even need an operations manual.
The biggest problem for you will be meeting the nationality requirements of Part 135. Plus the 2 year plus wait for the process.
Good luck.