Get the FAA Part 107 certification (required) and insurance. I use Verifly, but it can get pricey if you have several projects in different areas. Verifly also charges extra if flying in certain areas; ie, near a stadium, in Class E airspace even with an authorization, etc. I was charged $25 for $1M in coverage for 1 hour because I was near a stadium, even though I had permission and no events were going on. I did one Client Mission for DroneBase. It went very well and was paid the next day. However, uploading the required 4K video and photo files (9GB total) to DroneBase was a nightmare. Don't even try unless you have very high speed internet and it still takes hours! I tried two of the speculative Pano Missions but DroneBase rejected both. I shoot with the Mavic Pro that has a more limited field of view so DroneBase requires three different pano spins at 30°, 60° and 90°. DroneBase said they couldn't stitch all the pano shots together so I was rejected. Perhaps a Phantom would be better as only two pano spins are required 45° and 90°. Also, some of the properties on the DroneBase map are no longer for sale so don't waste time on those. Be very cautious if there is not a for sale sign on the property. I plan to keep trying with DroneBase.