1) Well, he's still quite young, of course he's technically fertile, but that whole social stuff may be still confusing, he'll figure it out with time.
2) LOL, you'll know when you see it, search on youtube for "rabbit fall off"
3) The girls have their moods and cycles, they aren't horny all the time. Also, the first mating could have triggered a false pregnancy, which makes the doe think she's pregnant and refuses to breed for some time. That, or she's already pregnant for real, that fall off thing isn't really absolutly necessary. And first timers might not exactly know what's that all about, or get annoyed by a buck that doesn't know what he's doing.
Apart from that, make sure you do have a viable plan for what to do with the offspring beforehand. Some people breed their rabbits because those popples are sooo cute, or they think they can make money that way, or they believe that cancer risk is lower for does that have been bred, or other such reasons that don't stand up to scrutiny.
