A plug-in for a video game currently on the Steam marketplace

There is a somewhat popular survival game called Reign of Kings in which I own a relatively popular community server. On the community servers, I have the choice to modify the game in what ever way I think is best and so far it has been a blast! Plug-ins were regularly developed during the end stages of Beta, but now the dev that was working on them is pretty much retired. I am super interested in getting a couple of different plug-ins coded because i'm basically at the limit when it comes to my coding skills ha! I am all self taught and to be completely honest, i'm winging it. The main plug-in that I would like made would be a "Map" function. I have the JPEG ready for my map, just need a simple /m /map /loc etc. type plugin that has a popup function which will display a map. I would like to stress that I have never done this before and I am willing to listen to input when it comes to what a project like this would cost.