Beginner advice on ecommerce

I want to set up a simple ecommerce site. Where do I start? I have heard that iweb is not what I want doe to SEO limitations.

Do I buy software? How do I figure out hosting? My goal is simplicity.

Any help would be much appreciated.

A few questions for you - how many different things are you selling, and do they have options (e.g. different sizes or colors)? Let me know and I can point you in the proper direction :^)