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I strongly recommend Niche Profit Classroom - which has excellent material for Selecting keywords, if really looking for profit, don't miss these video tutorial.
Everyone's brain works a little differently. you might think the search terms you'd use are so obvious that everyone else would use the same ones. it isn't so. ask random friends or customers what search terms they would use to research something like tires or to find your web iste. you might be surprised.
when choosing keywords, start by reverse-engineering competitors sites and sites that appear in the first threee positions on obvious search terms. view the source for thir pages and make a list of the keywords they use. Brainstorm other terms from your text.Then use this list a input for one of several tools that identigy good search terms and suggest alternatives.
Dont use search terms that aren't relevant to your site. companies have won legal cases against sites that use trademarked terms in their keyworkd list, hoping to divert traffic from the trademark owner's site. if your're an quthorised dealer for a trademarked product,review your distribution agreement. it generally specifies where and how you can use trademarked terms.
using keyworkd tools
overtures has a free keyword tool at http://inventory.overture.com/d/searchinvetory/suggestion after you enter alikey search term, overture returns the estimated frequency that the term has been queried in the last month acress all yahoo! properties. the tool also suggest related terms.
workdtracker offers a somewhat more sophisticated too at http://www.wordtracker.com/. you can gets reports on number of times a term has been queried in that past 90 days across all search engines, estimates number of times a term is likely to be queried within the next day, lists of number of webpages that share that search term on your target search engine and word tracker derives its own keyword effectiveness effectiveness index rating for each term.