As a commercial venture, your airplane and records will have to undergo a mechanical inspection by your FSDO for safety and compliance, and you will have to be enrolled in a FAA/DOT approved drug screening program, and when that's all complete you will then be issued a Letter of Authorization from your FSDO inspector allowing you to conduct scenic flights for hire under Pt 91 in that specific aircraft within 25NM of your departure airport.
It's a good amount of paperwork for about a month, but wasn't too difficult.
Mike-