They say that success is 90% preparation and 10% perspiration. By preparing early, you can get your e-commerce website up and going quickly and with less hickups. Remember, the longer it takes you to get your e-commerce store up and going, the longer you miss out on sales, and the greater chance your competitors pick them up.
Go through the following courses to prepare for building your website. Even if you have things set up, go through them anyway as there might be things you miss.