If you're entering the world of eCommerce for the first time, I would pay careful attention to the security of your website. If you plan to build on WordPress, make sure your developer is up to date on security protocols, such as making sure the hosting company has the latest version of PHP. WordPress is built in the PHP language, and some hosting companies are behind on updating, which makes it much easier for hackers to take control.

You'll also want to make sure you're up to date on tax considerations. For example, if you have customers in Europe, you'll want to educate yourself on the VAT rules that came into play at the start of the year and ensure your web developer knows how to handle them.

You'll also want to educate yourself on social selling, such as Pinterest buy buttons.

There are other considerations, of course, but those are the first ones that spring to mind.