Im not sure of any company names in your area but as for getting into 1, just approach them like you would any other job, you wont really need a resume just be friendly but most of us recommend going solo for mobile DJing if you can because some (not all) DJ company's are there solely for major profits for them...not you, and also they some dont really give you DJ gear to work with + if your on your own, you get all the pay, decide the times and music etc eg, we've heard story's here of DJ's working for DJ company's and getting $20 an hour while the company gets $100 and hour for you doing all the work, also gear story's like your given 2 CD walkmans with a crossfader box to DJ with.... not trying to scare you from it, just saying be careful of the company...