Change tax dependency status for financial aid, medicaid, etc. where to start?

I am 19 years old and recently married, My beautiful wife and I were both claimed by our respective parents on last years taxes. We need to change our dependency status so that we can find out about receiving additional financial aid and (hopefully) medicaid. I have looked around my local government website but honestly have no clue how to go about this. Hopefully we don’t have to wait until April 15th 2010 to qualify for any of this? Thanks for the input Flutherites!