Welcome to RIU, and the wonderful world of cultivating the world's most misunderstood and feared medicines!!!
The only 'advice' I can give you or anyone is to read and learn and then apply what you have read and learned to your garden and you cannot fail. Anyways, remember the search tool is your friend...Lots of folks here willing to help a new farmer get up and growing. But at the end of the day your grow will be only as good as the knowledge and work you put into it.
It is always great to ask questions but do not take anyone's advice or opinions and follow blindly. Do your own research, you will be much happier knowing you have done it for yourself and by yourself. The first buzz you get from your own budz...is by far the BEST high you will ever have!
Do a search using your current question as the keyword(s) and ZOOOM!! Like Wonka's Great Glass Elevator…off you go to tons of threads answering all your questions. Read all the Newbie Central stickies and learn…
After that you are a seasoned vet. Because to soak up all that information and sift through it, is going to take time. You will likely finish your first grow by then. Viola! grow complete and education well under way.
There is no law written or unwritten dictating that one must harvest all their plants at one time. Depending on strain some can be done in 6-7 weeks, while others may require up to 13 or 14 weeks. It's all about the triches...you have a decent scope. If you like a more 'heady' high the general consensus is about 20% amber...for 'couch lock'...about 35-40%
As for flushing there a lot of schools of thought there....some taper down as Maxwell said, some flush about 2 weeks before they believe the plant will finish, others will wait until the triches are about 1/2 of what they want at harvest (That is how I do it) and still others never flush at all. No right or wrong way to do it but like so many other things...it is the growerz choice when to do what to their plants.
