Hello, I've got an issue with a headset on this racer which I've got for my daughter (1st attachment). We left it hanging in my landlord's garage for a year because it was too big for her and somewhere along the line someone has clearly had a go at it because upon taking it back down the lower and upper headtube race are clearly missing as well as the ball-bearings. I'm writing with 2 questions.

1. Is this attached photo from the Sheldon Brown website the right thing to be going off for all the parts I will need?
2. As it stands the headset seems to be wedged into the fork even though the long bolt running through the stem for the handlebars is loose. That seems odd to me, but I'm also not 100% sure how to get it out, I'm a bit worried that it's already beyond repair, or that I push it too far.