Leaving it in the dark for up to 1 week will not hurt it and will deff increase terps density etc.
As for drying, there are so many methods. I prefer to take whole branches and dry that way for up to 10-12 days. Then trim individual buds and leave to dry even further, maybe another week. Weather heat depending.
Flushing, again, loads of methods. I stop for the last 2 weeks giving only phd water. Produces a nice mellow smooth smoke.
Good luck whichever way you decide.