First you should do some keyword research using google keyword search or key search. After that you can easily do your SEO process.
SEO is nothing but optimizing the search engine. So, for this you should be strong with your keyword you choose. For the Keyword research tool you can use keysearch or keyword planner. They both works amazing.
According to SEO, Keyword research and keyword analysis is the main thing. So if your know these things then the SEO process is really simple for you.