I hope you don't get too trashed by people questioning your idea rather than answering your questions. It's an ambitious one, but
- There are a lot of open source e-commerce solutions out there - Magento and OsCommerce come to mind. There are also hosted solutions like Shopify. Also, the big two (Amazon and BN.com) will let you post your stuff as well to sell. A Google search looking for e-commerce platforms, or a post here asking specifically for recommended e-commerce solutions, will give you much more detail on this.
- As a single-person operation, you really don't want to manage it yourself; you're in a crowded field, and you need to promote the hell out of your bookstore to succeed. Go with either a cheaper hosted solution or just joining Amazon/BN before you try to administer your own dedicated server or take care of a Magento installation.
You aren't giving a lot of detail on your biz model, so it's hard to tell whether joining Amazon/BN is in line with your goals, so maybe they're not an option. In that case, just set one up with a provider like Shopify and suck up the monthly fee and % take you have to spend - consider it a bargain compared to handling the IT side of your operation.
Maybe you can drop a comment on how you're going to compete with the big 2? I'm genuinely curious - you're going to be fighting an 800-pound gorilla there. It looks like you may be doing this outside the US, is that a consideration? What are you going to do better than they are currently doing to drive customers to you and away from them?