One thing you can do now before you even begin to take in animals is create some educational information. When people enquire here, I give them my leaflets about rabbit care, because for many, they have no clue and find it hard to get good information elsewhere.
By researching the leaflets, you will also learn a lot that maybe you don't already know yourself. By being able to send this to people electronically you will save time and energy. Each enquiry can takes hours from the beginning to the end/adoption so anything you can do to get people learning for themselves before they adopt from you has to be a bonus.
As for rehoming criteria, I am sure you know that there is a lot more to it that just hutch sizes - things like, ensuring that they new owners have a good rabbit vet, that they make suitable provision for when they go on holidays - (so many don't even think about this), that they feed a good quality hay and suitable food and understand why it's so important, that they can commit financially (yes you do need to know this so it's a difficult subject to broach and often seen as being impertinent), that the people have totally bunny proofed their gardens if they intend to free range supervised. So many people have no idea of what plants are dangerous and what constitutes a hazard in the garden (pond's, wells, sharp nails, places to get stuck). The list goes on.....
Be warned, if you advertise where you are, you WILL have rabbits dumped on your doorstep. People are cowards when they give up their animals which is why so many are dumped in the woods or left in a cardboard box under cover of darkness - you won't be able to control how many arrive at one go, and you could end up going from a couple of buns to 20 odd overnight - often mums and babies being dumped and mum being preggie again. And this could happen time and time again. I would not advertise where you are going to be unless you are prepared to put up security cameras to catch people doing this.
I do not advertise (apart from having our bunnies on RR) and I take on average about 3-4 calls a day. This might not seem many, but it takes an awful lot of time. And, if you don't get back to people quickly, they won't all understand that you are a busy person.
I'd make sure you decide how many rabbits you will help at one time, and stick to it, keeping an emergency only accommodation just in case you do get a stray or rabbits dumped.
Hope that helps a bit.