How to start a business on line? Help!

I want to know how to start a business on line?
The type of business that I want to start is being a reseller of other people’s products.

I’d rather not keep them on hand but have the items drop shipped from the manufacturer.

There are a list of suppliers that I found already and their terms are within what I feel I can make a profit on, but are there any types of licensing that I need in order to do this? I am thinking that if I don’t actually keep anything on hand, that there really isn’t much for me to do legally other than keep track of what I make and what I spend.
Is that right?