If an agent is hiring you for a residential real estate shoot, they will be expecting images of both the exterior and **interior** of the home. Do you have a good DSLR camera? Do you know how to use it, properly? If so, you have a shot (pun intended). I've met several up-and-coming real estate "photographers" who thought they could shoot interiors with their cell phones. I even met one who did all of the post processing work on their phones. None of them stayed in business more than one year.
I don't know anything about your photography experience or the equipment you have, but just owning a drone, with no other gear or experience in professional photography won't cut it. There's at least 50 other guys in your town who have the right gear, have experience, know how to frame and edit a proper photo and who know what to charge for their work.
I said this recently in another thread. I've been shooting for way too long to be worried about price matching a young kid with a drone. I charge for the value of my work and I charge enough to cover my expenses, keeping my business going + profit.
Now, if you have what it takes and are ready to go - offer your first few jobs for free. Doing a one-time shoot is nice, but getting a returning client is what pays the bills.