Gravel Backyard to Grass?

I bought a historical home (118 years old!) from an LLC that had been using it as a sober living home for many years.

To deal with the high number of vehicles parking at the house, the backyard was turned into a gravel lot. Yay me.

I have absolutely no idea where to start to be able to have grass and some native plant flower beds instead of all this gravel.

My immediate thoughts are a soil assessment and amending the soil after I remove allllllll the rocks. What else should I be doing? I’m willing to put in the hard work myself, but also willing to hire out for things above my skill level. I’m also okay with the notion this will probably take multiple years to get it in a good state for planting actual plants back there!