Oh I just realized what subforum this is haha.
Are you planning on running a server from home? Well it's bit complicated if you're completely new, but you can download the server zip from the bteam modpack page. Then you need to portforward minecraft ports (default: 25565) on your router. Then you can launch it and they should be able to play. I suggest finding a video on how to do it, as I explained it only very basically.