I had this trick:
1. Search for the main Kw's
2. Follow your 5 top competitors
3. Do what they do, but better: They have 300 words in the page, write 450, they have 100 incoming links, build 200, There are nice pictures on the page, make sure to have better ones, the page informative and updated weekly, update yours daily and give more info.
Be better, Google will see it, more traffic - more sales.