Okay, I took a look at the pictures and I think I can make some useful suggestions. Other members will likely be on this evening and I hope they will chime in on this too.
The eye gunk looks to me like an irritation that has got infected, rather than something really sinister like Pasteurella (snuffles). I would make a cup of either regular tea or chamomile tea, stir in teaspoon of honey if you have it and -- when warm but not hot -- use the teabag as a compress, dipping it in the cup several times.
Do not rub hard as it will make the problem worse. The compress should loosen the gunk and then you should be able to see how bad the infection is. There is a Terramycin eye ointment for animals that is fairly effective, but it is sometimes difficult to find it. You can try eBay if the problem warrants it. You may not need it for this; it depends on how the eye looks in a day or two.
The vent looks very red and I
think it is irritated rather than just from breeding readiness. It is hard to be sure from the picture, but it won't harm her to sponge it off with plain warm water, pat it dry and perhaps apply a
touch of mineral oil or petroleum jelly to protect the skin. Just a smidge because the may lick it off and while not toxic it isn't the best thing to be ingesting. There might be something better to use, but I can't think of it right now.
The foot pads on the doe look thin but not inflamed. With a resting board she will likely be okay, but do keep an eye on them. Rex are prone to sore feet.
The rabbit with the bare patches in its fur very likely has fur mites -- a common problem that you will not want to ignore, but nothing to get too worried about.
There are medications you can use, but since I am the kind of person who favours simple remedies, I suggest you get some DE (diatomaceous earth) and apply it to the affected area and those surrounding it.
The DE must be FOOD GRADE. Try not to inhale it or let the rabbit inhale it (it is dusty) but food grade DE is completely inert and non-toxic. I found some at our local feed store, but you may have to ask around a bit or go online.
They look like nice rabbits and I
think that with proper care they should do just fine. Do keep us updated . . . we like to hear how things turn out.
One request. Would you please take a minute to add your location (state, province, or country if not US or Canada) to your profile. It really helps to give you advice that is appropriate to your neck of the woods. So many rabbit questions depend on climate and other regional features. Thanks!