General Seo Advice

Hi Everyone

I'm sure someone must have asked this before but since I couldn't find anything I thought I'd ask anyway.

We build a lot of carts which often struggle to get found. My question is when you're building a new CS Cart website what are the best practices to get SEO off on the right track?

I mean this specifically to CS cart. is there any recommended changes to the code? Any particularly important addons? that sort of thing.

Sorry this is so broad but I'm sure it would be useful to everyone to see some general good advice.