Well Mark,

You are coming along very nicely indeed. Your plants are a little small for their age which is due to the low amount of light you presently have and the small pots.

Now for your questions.
1) When can you tell a male from a female? About two weeks after change the lights to 12on 12 off.
2) Your next stage? Your best bet at this stage would be to get a 400/1000hps and transplant into larger pots.
3) Are they of any use if you have to get rid of them? Only if you can take them to a remote outdoor location.
4) A segregation area? No, I would remove all them males but one. He will give you all the seeds you will ever need. Then you can pick a mother to clone for the rest of your life.
5) Are you asking the wrong questions? No, remember if you want big bud you need big roots. The more light and fresh air the bigger the buds.

Loco

P.S. Keep reading www.cannabis.com