Construction of your title tag is one of the most important things you need to do. Each page should have a different title with 2 or 3 of your keyword phrases at the beginning. When search engine results are displayed the title is the first thing people see.
Below the title is a description which will be either be taken from your meta name description content="Description phrase" or from the first sentence on at page. You description should also have 2 or 3 of your keyword phrases at the beginning as so should your first sentence. You should have a different title, description and first sentence on each page. You many also what to try shorter titles with only one keyword or keyword phrase as this will raise you keyword relevance. Also you can consider putting your domain name at the very end of the title.