Well first, CONGRATS!!
A couple of things to note.
First, since this is probably the first holding and the pair you ended up wih is pretty young, don't be surprised if he doesn't hold to term. In fact, this may happen a few times before he actually holds all the way to the end.
There really isn't too much for you to do at this point other than to keep an eye on him. Once he does hold full term, he should release the babies just after lights out, or at least within a couple of hours.
Now you have to figure out what you want to do. If you do nothing and leave the babies in your reef, they will most likely become reef food for eveything else.
If you want to raise them, you need to remove them from the tank. Some people have luck remiving Dad just before he releases. Depends a lot on the Dad. Mine always seemed to release about the time they saw the net so I had to catch them anyways and it ended up being stresful for everyone involved.
If you catch them, you will need live
baby brine to feed for at least the first few days. You should be able to wean them onto frozen brine and mysis within the first week to 10 days though. The sooner the better as brine are a biut of a pain and unless you fortify ro feed right after hatching, they don't have much nutritional value.
Remember that the male will probably end up holding within a few days after he releases. This gives him a short window to catch up on eating. Make sure you feed him well. Watch out though as your water quality can go downhill fast if you end up with a lot of un-eaten food.
Again, congrats. You might want to do a search over on RC for how to raise BC's......lots of info. Feel free to ask here as well as there are a number of us who either currently raise or have raised BC's in the past.
Mike