Hi! Congrats on your new bunnies! A good starting point is the BUNNY INFO section, which is full of useful information about diet, bonding etc.
But I’ll try and give you a quick overview:
Diet – a rabbit’s diet should be 80-90% hay, with 10% veggies, and 5% pellets. Horse hay is fine, but make sure it’s not got alfalfa in it, as alfalfa should only be given to young buns as it’s quite fattening. The veggies should be mostly leafy green veg, but it can be supplemented with a small amount of other veg like celery, bell peppers, broccoli etc. Pellets should really only be so that they get the added vitamins, rather than a staple of their diet. I personally give my 1kg bunnies a tablespoon each, but up to 1/8 – 1/4 cup per 6 pounds of bunny is an acceptable amount.
Try to keep non-hay feedings to 2 or 3 times a day, so you encourage them to eat hay throughout the day. If they know they’re always about to get a veggie treat, then they often don’t bother with eating enough hay
Things like small pieces of apple, carrot or banana, or a berry can be given as a treat a couple of times a week
At this stage, they shouldn’t be allowed to spend time together, as rabbits can get pregnant from a very young age, and it can be very dangerous for them. Unneutered and unspayed rabbits are also likely to fight when hormones kick in, so its best to keep them separate at all times.