I reccomend that you narrow it down to what you will and won't keep, and what sort of enclosures you'll need for that. Will you keep all the rescues in one room? What if something comes in that seems ill, will it go into that room?
Can you have several "foster" homes? If so, you could have one person do beardies, another does ball pythons, someone does boas.. that sort of thing. That way it's all one type of feeding, one type of enclosure, so you could set up a set or racks, all for one basic type of animal.
Feeding a larger group of beardies(even if each has it's own enclosure) seems like it would be much better than feeding some beardies, some iguanas, some balls, some corns, etc. With one type, you could fix a large portion, or thaw a bunch of one item, and feed.
Make certain sure, that you get written ownership of the rescue. I always get a paper, signed, with a witness signing as well. Give a copy to them, and a copy for you.
You might want to write up a protocol for every animal taken in. Keep records. Who will keep it, for how long, does it get a vet check? That sort of thing.
It's a big undertaking, but it's so very much needed, so kudos to you for even considering to take on so much work. I hope this helped.