Not sure where to begin but there really isnt any difference between SEO for new sites and old sites.
WOW, you have posted some pretty generic questions all through this forum today. I suggest you read the thousands of documents and forum posts on this topic before asking a question like that.
Universe, I'll be a little more generous. 1. Research your market category and get your online strategy. 2. Carry out keyword research and select your target keywords 3. Build into your on page - meta tags, title tags, content 4. Build into your off page - anchor text, target sites for inbound links 5. Monitor rankings and traffic - amend site appropriately For a graphic see: Search Engine Marketing Over Site
Manage your keywords properly. Think of the best main keyword for your site. Put your keywords on alt tags. If you are done enough, build links or update your site from time to time for more traffic.
there is no difference between old and new, just do everything from on page optimization to link building, and when u get out of the sandbox, you will see some serious improvement of your ranking.
First thing to do is to pick the keywords or search phrases that you think will give you the most success. Dont pick keywords that are too competitive. Next thing you want to do is optimize your site and make it as relevent as possible. Then you start building links.