What are the abandonment laws and how does my husband adopt my son, the bio father has never been in his life, no contact whatsoever for the 11 years since he was born.

This business about abandonment is not the real issue. There is a sticky on the top of this forum that explains what it necessary to allow your husband to adopt. There are also umpteen threads that discuss the same issue.

Bottomline is you need an attorney to file the adoption petition. That attorney will advise you of what you need to do to terminate the bio father's rights to clear the way for the adoption.

Yes, basically there will or has to be an attempt to find the bio father, and get his permission, if not possible there is legal posting that has to be done. This will require an attorney.

Filing abandonment alone does not allow your husband to adopt. Along with him not having contact, if he has not paid support as well... then you have a chance to get his rights terminated.

You will need to contact an attorney first and start there. You will need to petition that the bio fathers rights be terminated due to abandonment and to allow your husband to adopt. But if the bio father shows up and show any interest or fights his rights being terminated, you will be in for an uphill battle.