Adult Adoption

I believe I've found all the forms I need for an adult adoption. I'd like for my stepfather to adopt me. I just want to make sure I have all the correct forms and the correct process.

These are the forms I've found:
12.981(c)(1)
12.981(a)(2)
12.981(c)(2)
12.981(a)(1)

Are there any forms I'm missing for the adult adoption process? Also, once all the appropriate forms are completed do I just file them at the courthouse? Thank you for all your help!