@shood212,
Google "uncontested step parent adoption" + the name of your state and you should get some good information about what is required.
It cost my niece about $2,500. She's in Texas.
Whatever it costs is worth it.
My brother's mother died in childbirth, when my dad married my mom she raised my brother as her own child but never formally adopted him. When my dad died the lack of having a formal adoption caused all kinds of weirdness. Even though all of us kids were adults and agreed on a certain course of action it was impossible to do because no adoption had happened. My dad's been dead for more than 10 years and it's still causing weirdness.
Do the adoption despite the costs. Have a will drawn up while you're at it.
Good luck to you and yours.