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The search engines are getting Broader at learning to crawl complex websites, but you need to make as easy as possible. Avoiding JavaScript, Image Maps, Image Based navigation and session IDs are just a few of the pitfalls many newbie's miss. Create your navigation in CSS or standard text. One way to see if your navigation is easily crawlable is to check the Google cache and click on the link "Click here for the cached text only." If you can see your links in hyperlinked form you are probably ok. This is probably the most universal issue I see as a problem on SEO newbie's and even some of have in common. Get this fixed and do nothing else and you could see large improvements.