Need some expert advice on the process!

I need some expert help! I am starting the process of adopting my beautiful stepson! He is 15 and I have raised him full time since he was 5 years old. The BM has had no visual contact with him for 2 years and no written communication with him for over a year. She gives no financial support. She has agreed to sign over custody to me- yea! I am preparing all the forms I need ( I live in El Dorado County, CA) and I need some advice on the process. Here are the forms I have prepared: Adopt-200 Օ Adopt -220 he is American Indian ֕ Adopt-210 Adopt-215 Օ Icwa-010 (A) ICWA-020 Օ Form that relinquishes rights of BM My question- do I contact a social worker to set up a home study? Do I then go to the court with all the papers and the home study completed, and then they officiate it that day? Or do I go to court with my paperwork, then the court sets up a home study then go back on another date to make it official? Not sure if I should get an attorney or not. It seems straightforward but I want to try my hardest not to look like a goober in front of a judge. Any advice on what to expect is greatly appreciated! Thanks all!!