@Photography Pilot
First welcome to the forums
I have my Part 107 and the main purpose I obtained it was to fly a drone owned by the company I work for. Right now, IMHO the use of UAS is rapidly growing with lots of people jumping in with hopes to capitalize on the market.
Like any new true business venture, it won't be an overnight success - it will take leg work to get your name and business out there.
Like you said - there are many facets of this type of business to chose from. Before starting a business, you have to decide what you want to do – that will help you decide what equipment you will need.
Reviewing the forums here and asking questions should give you an idea of what venture to pursue.
Good luck with which ever field you choose