Only recommended keyword is 5 to 10? but its up to you, but the best match of matching keywords to search engine,i recommend
5 to 10 keywords thats the best match when people search and find your own site.And for the set up of your keywords you need somehighly and recommended competitive keyword you may visit to adwords.And also look out for one or two long tail keywords,(these are the phrases that people might search for when they are looking to a site where the same of yoursthen...
