There are obviously a lot of different routes you can choose, depending on how natural you want to go. For the ants, you can try corn meal on the mounds, and a friend swears by peppermint oil to create a barrier in the house. But...I agree that you might want to call the pros to come in and treat the inside and outside of your house. Even if you just did it for 3 to 6 months (since terminix usually comes quarterly), you could get it under control.
For the flies, if they are house flies, then you probably just need to make sure keep all doors closed and have no holes in your screens. If they are fruit flies, etc, then be sure to check what's on your counters. Keep all food out of reach and throw out anything that's going bad. Those fruit flies can come in from the store, too, so you have to keep an eye out.
For the fleas, it's Florida and hot, so they will be everywhere outside. The key is to treat your animals with the stuff from the vet. Sentinel, Frontline, Advantix, etc. Your dogs will be so appreciative! For your house, you will have to treat the inside to get rid of the eggs....not sure if that's something I'd try on my own. Perhaps getting an estimate on that would be the right way to go. And you can also treat your yard. Companies like Terminix will treat the perimeter of your house. If you decide to hire them, you pay a set up fee for the initial intensive in/out treatment, but then your quarterly fee covers unlimited visits to your house to treat until everything is gone. We have also used a yard treatment, I think by Scott's, that you can get at Home Depot, etc, that is supposed to help with fleas and mosquitoes in your yard. It's not expensive and could be worth a try...but be sure to get your inside taken care of too so you don't chase them inside.
Good luck. Bugs are the worst!!