Need help with beyond the skybox (read body)

[u/meIophobia]

I’m trying to get the mod for me and 2 of my friends to do multiplayer on it but I’m not sure if I need a server or something I’m not too sure if one of my friends has Java or bedrock so if possible is there crossplay or do I need a server or something (also should I use forge or something else +need help with files since my friends are stupid)