Well you can start from reading and then implementing this ideas you have read, its a learning process as you go
Internet can give you a lot of answers for your question. Google, SEOMoz, SearchEngineLand and a lot more lets yo learn more about SEO... Read and let those data roam your mind, then, try it on actual...
Read these sites and DP also http://www.seoconsultants.com/blog http://www.searchengineland.com/ http://www.mattcutts.com/blog/ http://www.seomoz.org/blog Thanks Nitin
You can read and get basic idea about SEO process as well as services online.There are lots of articles and blogs online which have really nice presentation for learning SEO. SEOMOZ, seobook, seochat etc are very good. But only reading will not clear you every service briefly so you have to work practically for getting proper knowledge.