I have 3 English Angoras; Albert, Terry and Nigel and they produce so much muck, I'm now having to let some of it go in the council green bin as I literally have more than I can use.
One thing - avoid using sawdust - there are products out there like Megazorb (horse bedding but looks like kitty litter) that are safe to go straight on your garden and don't need to be 'aged' for 6 months before they go in the soil.
The old 'girls are cuter/better natured' doesn't apply to rabbits. Many people find bucks to be friendlier than does. Of course that's a generalisation, and individual bunnies have their own personalities just like dogs or cats. But starting out, if you get a choice of gender then male is probably a safer bet.
Mine are housed in large hutches inside an outhouse but n the spring and summer they go out in the daytime in runs on the lawn. If I am artful about moving the runs, I find I hardly need to cut the front lawn as the bunnies keep it clipped and fertilised. Of course the corrolary of that is, if you garden organically it's safer for the bunnies. And their vaccinations must be upto date if you're putting them on grass.
I did have a doe who had an entire old garden shed to herself - and a hutch left open inside it as her 'bedroom'. We lino'd the floor, and cut the door in half to make it like a stable door and put a mesh door under to keep out the cats. She loved having a whole shed to herself. Many people buy kiddies' play sheds from B & Q or Homebase or wherever and convert them (with an added run and a catflap into it) into excellent rabbit housing.
Buns are easily litter trained - I found them easier to litter train than any cat - as they tend to pick one place to poo in. So you star by putting the tray there. They soon get the idea.
I don't think breed matters - anything shorthaired. I have longhaired as I have the time to groom them and also I spin the fluff. But wouldn't recommend longhaired except to other people who want the wool as they are very maintenance heavy. The plus side is, they've been bred for a couple of thousand years as domestic rabbits (angoras are the oldest breed) so are extremely easy to handle, and human friendly.
I had a Rex a couple of years back and he had the most personality of any rabbit I ever had - buckets of character.