As above, wash and then clay the car to remove bonded contaminants. SRP is a bit of an all-in-one product. It's good by hand because it has lots of filling ability, so rather than abrading away the mark, it fills it.
I'd be careful with what I'd apply on top as you risk pulling out the fillers. Lots of glazes have cleansers which would undo your hard work. If you really want a glaze, clearkote yellow cream wax is good - despite the name, it's still a glaze. Otherwise I'd skip it and move straight to sealant. A wax on top is up to you. Some consider it overkill, others just enjoy applyig a wax for the sake of it. I wouldn't bother unless in winter, when you might not wash and top up as frequently, so wax adds that extra sacrificial layer.