Welcome to the forums, post in the new member thread and introduce yourself. I assume you mean a PC game like mordheim? I have no coding skill of any use. But I would be willing to help with other things as my time and ability allows.
From a simplicity perspective I would suggest making it a grid based game, even if that is not fully Mordheim authentic.
Also if Mordheim is the goal I would recommend starting with basic core warbands only. Maybe even just start with 2-4 lists. Skaven, Witch Hunters, Possessed, Undead would be my recommendation. Or swap out undead for one of the merc lists.