SEO Basics! E-Commerce Website

Hi,

I am running a magazine subscription business, it is still not up and running yet. Here are a few samples of the same compeitiors.

http://www.magazines.com/ncom/mag?redirect=1
http://www.magsonthenet.com/
http://store.yahoo.com/magazinetime/

The site will be up within a month or so, I would like to know how to get my website on the search engines.

I would like each magazine to be on google, and a couple other search engines.

How would I go about getting my website on google and other search engines in the top #5.

Keywords I'm looking to go for;
cheap magazines
cheap magazine
magazine subscriptions
magazines
magazine
discounted magazines
etc