135 Start up.
Obtain the 135 checklist from your local FSDO for startup, The process starts like this: You submit a letter of intent with your resume to the FSDO that oversees the region in which you will have your base of operation, you submit an application to the D.O.T., you make sure you have full use of the type of aircraft that you will operate and that this aircraft is U.S. registered and the it meets all the maintenance and equipment requirements of FAR parts 43, 91, 135 and that all A.D.s and Service Bulletins are complied with and up to date to pass the 135 conformity check, You submit a letter of compliance telling the FAA how you will comply with each 135 rule applicable to your type of operation. You submit a carriage/noncarraige training program for HAZMAT, and then once everything is approved pass the 135.293 checkride and you should be issued Operations Specifications and an Air Carrier Certificate from the FAA. The compliance letter can be written by a consultant as well as the HAZMAT program or it can be obtained on disc by asking the FSDO and doing it yourself. Sometimes this process can take up to two years to get approval even with a consultant. I hope this helps as I have been through the process and successfully was part owner operator for a single pilot IFR 135 operation with two multi-engine aircraft in Florida for 6 years that is still operating. Goodluck.