I think you could easily find a community lawyer and have them work pro bono (free). Meanwhile, keep all requests, texts, chats, recorded phone messages, etc. Do not participate in requests for naughty pictures so he cannot use this against you. If it is in the decree that he pays you…then he is on the hook to pay you. States cracked down over the past few years and will garnish wages, jail, and force a deadbeat parent to pay what was decreed.