Today I found a great sites that will help us to manage our stores easier. I'm always writing down every site that I find helpful, and honestly I have more than 30 and the number is growing. So here is a link to only one site that has everything that you need to manage your shop (Etsy store).
And another one how to use twitter as a promoting tool for your product HERE!
Good Luck and I hope this information is helpful for you!