A properly set up and administered LLC is a great idea in this situation. You'll want to make sure it's set up correctly and that you follow all the rules to a "T". The slightest mistake and your "Corporate Veil" is easily pierced should someone come after you. I let my accountant and attorney do this for me and just traded out services for services. I think I set everything up for $200 complete including my accounting software and everything.
Yes you can operate in the "red" during formation which is normal (not really optimal business speaking) but it happens and is not penalized initially. Remaining to operate in the red means something is wrong and major changes need to be made. Just don't go overboard and over extend yourself in the beginning because the deeper the hole you dig the longer it takes to get out. Operate lean and mean and don't be afraid to utilize FREE services (social media for advertising, charity events etc ) to get your name and business recognized.
You'll want to create a recognizable "Brand" and stick with it from the get-go. Getting a good looking logo, webpage, business cards, and other "media" that is complimentary to each other is a great idea. If you want to do it at a discount check your local community college to see if they have a "Print Shop". You'd be amazed of the graphic art work you can get designed and printed for pennies on a dollar there. Our advertising budget for my day job is 1/10th what it was because we utilize the local Community College for the majority of our Graphics Artist needs and printing services. We get flyers, business cards, business forms, brochures, posters and just about everything printed there at a huge discount and they are quick. We order by lunch today and pick up tomorrow. That time line does not include design work. That's for print ready work.
Also spend a LOT of time developing your name/logo. You want to make 100% sure it's free and clear or you may end up redoing everything in a few months when you get the Cease & Desist letter from a competitor with the same name. There is more to a name than "last name+drone+photos". Stand out from the crowd every chance you get.
Lastly don't skimp on liability insurance. It's fairly cheap (in aviation terms) and could also save your personal assets should something go wrong.
Good luck and Safe Flights.
Allen