If you have a standard model in mind, bring a picture unless you're sure you can specify it in their lingo.
Think if there are any required extras, like toe taps or thick soles.
They'll ask what kind of toe shape you want-- have a theory about round vs square.
If you get a chance to specify overall shape, remember that "Blobb" often defaults to potato shape.
Not sure if their current staff is still working that end of the spectrum.