I am a US citizen who is currently living in Mexico with my husband we have been together for 4 years but haoive only been married for 2 months we have a 4yr old son, We were living in the US but moved to mexico about 3 yrs ago because my husband had trouble finding a steady job. He had some problems while living in the US for about 8 years like being arrested for having no drivers license but he never was deported. Also he was currently on child support before coming to mexico. He now wish to go back to the US legally but we really don't know where to start or if he even has a chance for obtaining a green card since he triggered the 10 yr bar after coming to mexico?

He is still on "child support" and hope he is paying,just moving to Mexico does not stop his debt on that.

But you hire a US immigration attorney to start the process

Fix the "child support" issue first. Being illegal in US is difficult enough... recommend you discuss this immigration issue with experienced attorney.