Being an owner of 2 full line pet stores in the past, I would agree with the suggestion of working, even part time or weekends, for a while in a store to give yourself some product knowledge. It may be as easy as ordering some products and opening an online store but I doubt it. You need to develop an understanding of how this industry works and also the products to choose so you don't end up with a garage full of aquarium products you like but may not apeal to others. If you decide to proceed, good luck in your endever and may you prosper.