You need to buy a tyre machine that will take up to 23inch wheels. I would go for three phase rather than single phase. Must have arm assistor. You dont need kit for centreless wheels very expensive for the amount of time you will use them. I would go for fully automatic but semi might be ok as a starter. Balancing machine I would go for the best you can afford, self calibration would be great. again three phase. Dont forget tyre deliveries you need a good back up, cant stock everthing.

Keith