There are a few things that you should look for when choosing your ebook software.

1. Choose ebook software with a secure shopping cart and an automated fulfillment and sales tracking system.

2. Choose ebook software that has an unlimited publishing option.

3. Make sure that ebook software that allows one publisher to publish multiple authors.

There are currently so many ebook software out in the market that helps you creating your ebook. Those software often charge from FREE - $300. This really depends on how professional you want your ebook to be.