As some have said below, there is more information that is needed, and you should be giving that information to a mortgage broker. 600 is pretty darn close to what most require (between 620 and 640). It also depends on your circumstances. There are special programs out there for down payment assistance or financing options for people who are teacher, firefighters, paramedics, nurses, doctors, radiology techs, first time homebuyers CPAs, Dentists, veterans, national guard, etc, etc, etc.
If you would like to give me a call, I can give you the name of one of my lenders who can get you into a program that would be best suited to your particular situation, run your credit and look at your scores. Some programs are flexible on credit scores also, and may dip down to 600 if you provide a lower down payment or will give you the name and phone number of someone who can get you up to that 620 area, usually within 30 days (from around 600 like you say).
Look forward to talking to you
It's more than real estate. It's RAYL-Estate!
Keller Williams Elite