This is the NaNoWriMo* handbook. It's perfect for the task in that it contains a limited amount of extremely suitable advice. It's also extremely funny. That makes it worth reading even for those writers who don't feel inclined to embark on a 50,000 word sprint. What it doesn't contain is a lot of detailed, highly technical knowledge about what good writing should be like. That just wouldn't be in the NaNoWriMo spirit!
* In case anyone didn't know, NaNoWriMo is an annual novel writing event in which participants dedicate themselves to the task of writing a 50,000 word novel in the month of November.