First, go to a credit counselor. They are available for free, do not pay for this service. You'd be better off improving your credit score and understanding the value of good credit and how to maintain it first. There is a reason why his credit score is so low and you both need to understand how to fix it and how it affects you in many aspects. Once you have done that, your interest rate will be lower when you borrow, and you will have a much better chance for success. Best of luck to you.
A score of 530 is an indication that bills are not being paid in a timely manner. Review your credit report. Pay off all collection accounts and judgments. No one can close on a mortgage with an open judgment and only medical collections can stay open. Bring your credit cards to no more then 50% of your limits. Your husband's credit score will go up and then you can consider buying a home.
You need to get his score to at least a 560 or maybe even higher. Find a mortgage broker who can analyze your credit to see what needs to be done, A good credit repair company may be required depending on the situation,
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Consider improving the score a bit more, the better the score the better the rate; however without your overall financials, do visit with any loan officer; after reviewing your information, a determination on qualification can be made; at the very least, if you don't yet qualify, you'll know what needs to be done in order to be eligible in the near future.
You probably need to do just a little work on the credit score. The best thing you can do is talk to a good mortgage banker. They will be able to tell you what you can do today and, if there is work that needs to be done, what to do and how long after that you can expect to qualify for a mortgage.
good luck, it sounds like you are close. Probably just need a little work on that credit score.