$7.00. YOu should tip on subtotal of bill including the salad that you got for free. Bill around $32.00 pre tax. That would be about $6.40. I would round up to $7.00. If service is great, I give more. A couple of dollars to me is not as important as a couple to your server.
Suggest 3 wheeled with 2 wheels in the back for better balance. Like the adult 3-wheeled tricycle. Whatever it would be easier on 3 wheels. I would buy one for errands.
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Depends on your taste. I was shocked but I like rock and roll. Who controls the votes? The age group would probably tell more.