i wouldn't waste my time on a male if i were you, the best thing to do is trial and error, i know you don't want to kill a female but much like humans males are much easier to care for than a female. just remember not to give nutrient before three weeks old just distilled water and always use a 20-20-20 formula for the veg cycle, also go to greenmanspage.com and read ten biggest mistakes marijuana growers make it helped me out when i first got started.
Good Luck!