For 2 weeks we've been trying to get information about filling the papers with INS, but we never get any good answers. You will need a co-sponsor. The co-sponsor must provide the same evidence of income as your husband. But it's not strictly necessary. Normally, I go personally to submit for my clients.
Most lawyers do that.
In my experience, INS will already know your arrests. So don't try to hide any. It is important that you consult a knowledgeable lawyer about arrests. The reason is, many aliens show up at interviews only to find themselves being thrown into deportation proceedings because of arrests they thought were harmless. Be very careful and consult with a knowledgeable lawyer.