Milky trichs is where you want to be. Clear=premature Milky=Prime Amber=past prime. Of course all this depends on strain and such. If you know your strain I'm sure you could find the average flowering time. If strain is unknown I believe the average flowering (from what I have read) is 8-10 weeks. You want to do your flush the final week. Also doing DWC you should really try to do atleast 1 water change during the week, more wont hurt. If I missed something you wanted to know about let me know and I'll try and help.