Do i need to make a new account or can i use my exisiting accoun?

Does the domain have a wait time until it can used again on the new store? Also will all stats come with backup/duplicate? For shipping, Billing and other info, does that also transfer? Do i backup or duplicate?

On may 13 i changed plan from starter to basic to try it out now 12 days later i feel i dont need the basic and want to change back to starter. I went to contact support but they said it was a one time thing for new merchants.. At this time of my bus...