Im scared to put him on child support. How will he be served?

I started to fill out the application online then regretted it and got scared twice. I know he will be so angry, i know his family especially his mom will talk bad about me and be angry as well but he has walked out on me and the kids. Its happen before multiple times and im finally tired of it. His mom says he will come back since its happen before although i am the one who always asks him to (dont know why) but iam ready to let go and not beg him or find him. He knows i wont be able to afford rent and told me to figure it out myself. I did mention him about putting him on child support and he freaked out. He still has all his stuff in the house and i know he's been staying at his friends house but not living there my question is what adress do i put? Can i put the same adress we live in since it is still kinda "his home"? I know last time after he got tired of being with his friends he stood at his moms place but i dont want the papers to go there at all. He doesnt really have a work place since he does lyft driving since i read somewhere they could be served to him. What can i do??