If you are selling online, and especially if you have an etsy.com shop, then you should know about "Sellers Assisting Sellers" - a blog with lots of useful tips for online selling.
From Time Management to The Effectiveness of Banner Advertising to useful browser add-ins (which are little pieces of software which get added to your browser to make it more useful. If you are still confused, a browser is what you are using to read this article. Probably. )
Check it out, it is definitely worth it!
Oops - sorry - link fixed now!