A useful nugget:
Describe the book you've written as though you're telling a friend about a great book they'll want to read right now.
Mutterings and Musings on Writing and Publishing
6. Use commas to separate two or more coordinate adjectives that describe the same noun. Be sure never to add an extra comma between the final adjective and the noun itself or to use commas with non-coordinate adjectives.
5: Pairs of adjectives are exponentially worse than single adjectives. The ‘big, old’ man walked slowly towards the ‘tall, beautiful’ girl. When I read a sentence like that, I’m hoping he dies before he arrives at his destination. Mind you, that’s probably a cue for a ‘noisy, white’ ambulance to arrive. Wailingly, perhaps!
First contact was not supposed to be like this. The first intelligent species to encounter Mankind attacked without warning and swarmed locust-like through the solar system. Merciless. Relentless. Unstoppable. With little hope of halting the savage invasion, Earth's last, desperate roll of the dice was to send out three colony ships, seeds of Earth, to different parts of the galaxy. Earth may perish but the human race would live on ...somewhere. 150 years later, the human colony on the planet Darien has established a new world for Humanity and forged a peaceful relationship with the planet's indigenous race, the scholarly, enigmatic Uvovo. But there are secrets buried beneath the surface of Darien's forest moon. Secrets that go back to an apocalyptic battle fought between ancient forerunner races at the dawn of galactic civilisation...