I work in a pet shop and was previously a vet nurse.
Male rabbits tend to be the friendlist and are much easier to neuter than the females as all their bits are outside!!!
They need vaccinations for myxi and VHD, if you live in the country then myxi is usually done twicw a year (this is the most important one) VHD is done yearly (viral haemaorragic disease - causes internal bleeding) not so common but is around. You can get problems with their teeth - some need regular clipping and burring sometimes every 6 wks or so. Flystrike can happen in the summertime, you need to make sure everything is clean and check there are no faeces around the bottom or any open wounds.
You need to buy as big a hutch as you can afford also a run for the garden, beware they can burrow under and out!! so dig down and put some wire mesh underground to prevent this.
TBH they are not great for young kids as they can be very strong and have a powerful kick. Guinea pigs do make easier pets for littlies, need no vaccinations, don't need as big a hutch and are much easier to handle. Most common ailment is vit c deficiency - just make sure they eat a diet supplemented with vit c and they get plenty of greens!! Also watch out for mites!! can get them from dodgy bedding, or sometimes already have them from breeder can cause hairloss and itchiness.
Sorry have gone on a bit, can you tell i talk about this day in day out along with fleas, worms, food, and lots of poop problems!!!