If your incubator holds 24 eggs, stick them all in
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For posted eggs be ready for about 50% failures.
Your hubbards will only be around for about 10-12 weeks, at which point your others will not be fully grown, so your coop should be OK for a short space of time.
After hatching you will need to separate the hubbards from the sussex and faverolles, as if they are being brought on specifically for the table, then they will need a different feed/regimen.
For the first week they can all eat chick crumbs ad lib, but after a week I would put the hubbards on a 12h/12h sleep wake cycle, and remove food for 12 hours each day, otherwise they may gorge and this leads to leg and heart problems.
After 8 weeks, the sussex/faverolles can go onto a normal growers, and the hubbards can go onto a grower for meat birds (I don't know what it is called in English, in France it is "poulet engrais").
Depending on their growth rate, the hubbards may be table ready by about 10 weeks, before first crow. normally I wait until they start crowing, and the first one to crow is the first one to go. As I'm only feeding myself, I only dispatch upon crow. If you want to do a "batch" you may want to have a dispatching day when you slaughter all of them together.
If the Faverolles are salmon, then you will be able to tell the boys from the girls by about 2 weeks, as they will develop dark/black chest/wing feathers, the girls will remain pale/salmon coloured. For the sussex you will be able to tell, quite reasonably, by 8 - 10 weeks, when they start to develop comb/wattles and pointy hackle feathers.
As for vaccinations - well vaccinating a very small number of birds can be quite expensive. Personally I've never observed any cross infections from vaccinated birds to non-vaccinated in my own flock, but that's not to say it can't or wont happen. Also as a personal preference, I would prefer not to vaccinate the meat birds - but that is just me.
Good luck with your venture. I love hatching, and once I get my current birds assessed I'm going to do a couple of late hatches, hopefully of birchen Marans, if my contact still has any eggs.