xiiRockstarrTv

So a friend of mine has been working on a custom made mod for me and himself for a project we're working on, but the mod is only compatible in single player minecraft. Since neither of us is experienced with this, I just wanted to ask around and see if anyone has encountered this before and/or has any solutions on how I'd go able making his mod workable on a multiplayer server. The version of forge we are running on is 1.7.10.