i would keep him as far away from the ladies as possible. when did the males show ? i have had some show in veg and continue to mature which was great...no females mature enough to pollinate ..if you plan on collecting pollen then brushing your girls i would just keep him in a separate room with a few cfl's. i was lazy and had the male and two ladies (diff strains) in the same room having their threesome..i would just shake the male over and through the two during the third week of flower..but do remember if and when you touch or do anything with that male (pollen) do not go anywhere near your girls in flower until you are completely clean..shower and new pair of clothes.
depending on the branch size, i would say 20-30 seeds. i now like to take the top half of the female and cover with something (rag, sock, ect.) and just dust the bottom half. this works well the third week into flower when the hairs are nice and sticky, plus you still get the top half of nice bud...and lost of seeds...