You could make professional (promotional) video's for events with your drone. Big events like to make video's with a drone because they give a better view (on the crowd).
Offer your service on some freelance website's and also make your own website to promote your business.
Another business idea is offering a service to film real estate that's for sale with your drone. You contact owners or real estate agents that have big houses for sale with a huge yard. You could ask up to 500 dollars for a hd drone video. Tell them that a video will give more potential buyers for their house because it looks more appealing. (Which is not a lie.) And when you think about it, on a house that costs >500 000 dollar, it's not a lot of money that you are asking for a video. I know someone that had exactly this business and he earned good income with it. Real estate agents ask high commissions... You are not the one ripping them off.