1. Title Tags
Your title tags can be anything that you want them to be, because it is what is going to show at the vary top of the page.Something you'll want to consider though is to make sure you are including some keywords to help with optimization. And, will interest your shopper in clicking on the items in question.
2. Meta Descriptions
Meta tag description is a statement of what the site is all about. When crafting one, think of the snippet from the search engine that you want to be seen, as most search engines pick up what you have stated in your meta description tag as your site description.
3. Alt Tags
Alt attributes are a way to describe images to search spiders simply because search spiders cannot see them. It is not only an opportunity to add more content (with keywords) to your site, but it also helps your images to be searchable on Google. For best results, all images should also have distinct filenames.
Make sure all your web pages are on the sitemap, unless you have private pages that you don't want to be indexed, they can be excluded with a robots.txt file,The best way to do a site map is with this free sitemap generator - www.xml-sitemaps.com - you can do one for yahoo or google and also one in html - all automatically.
Robots.txt is a text (not html) file you put on your site to tell search robots which pages you would like them not to visit. Robots.txt is by no means mandatory for search engines but generally search engines obey what they are asked not to do.