Have you ever had an account before under a hosting company? If not, I would suggest that you try several control panels and see what you think your customers would like best. Then learn it as much as possible so you know how to support them.
Then make a business plan.
Then sign up for a reseller account.
Learn the reseller control panel (you could also do this while you are creating the business plan).
Then go get customers. It would really be helpful if you would start with one or two that you could host and explain that you are learning how to host accounts but will find all the answers they will need. Then give them a break on their hosting while you learn.