I had once thought of opening a scooter shop. Some things I thought of at the time. Maybe these questions will help you too! Good luck!
Who will be doing the mechanic work on the scoots?
What will the mechanics salary be?
At the start, before many scoots have sold, service work might be slow - what will the mechanic do all day?
What will it cost for a sales person to be on site when you are working your other job?
How much is insurance going to cost? Will it include claims for improper service work?
Having a mechanic on site became an issue for me. Hopefully you've got that covered.
Look forward to reading more as you move forward!