Fleas, your going to need to treat the animals that are the host's. Frontline monthly is probably the best, easiest product. Flea powders, bombs, flea dips, flea collars, flea shampoos only remedy the situation for a very short time and require work...
Mosquitoes, you have to get rid of any standing water. Citronella, bug light, etc...
Ant, liquid peppermint where ever you see them on a paper towel.
You could also just call a bug exterminator like orkin.