Dont worry about having different/same sex plants near each other durring veg.
And for nutrients look here The Cannabis Cultivation GrowFAQ - The Internet Hub for Marijuana Cultivation - Organic fertilizers, NPK values and amounts to use This is from a revised version of the overgrow growfaq, any questions consult there first. Cannabis.com has it's own growfaq, but I find it to be a bit of a pain in the ass to find what i'm looking for alot of the time. But at any rate between all the different stoner sites growfaq, who in thier right mind would buy a book? It's like thier giving away gold!