Welcome! I urge you to read through the Bunny Info. sections of the site to learn as much as you can about all the different facets of raising a bunny. Pay special attention to the Bonding section, as well as the bonding forums.
While you got them both together, they are not necessarily bonded, and due to their ages, they will have their hormones kick in which usually breaks any sort of bond. There is no real attachment as siblings, so you will want to start a bonding process for them as they mature in a few months. Meanwhile, unfortunately, determining the gender at this early an age is very, very difficult – even for vets. So there is a risk that you have opposite sex bunnies, and that can lead to an unwanted litter. I would get a second habitat to be able to keep them separate in their own space for when they begin to get active hormones. It will happen before you can see it, so you really want to start arranging the housing now before either fights or humping starts. (And humping is a dominance gesture, not just a sexual one.) The next step is to make an appointment with the vet for one, then both, to be spayed as soon as possible. Once that is done, a month later they will at least be safe together as a bonded pair. Hopefully the will continue to like each other and the bonding will go easily, but if one turns out to be male, he can be neutered easily. Both need the procedure for their long term health.
If you have them in separate habitats, they will learn their individual names quickly and easily. You can have play time together, or staggered if they show signs of fighting. You can see more of their individual personalities that way too, as they dig, or toss things, or climb or hide. It’s really amazing how different bunnies can be, so you can relate to them in their own way as their personalities emerge.