Do you have any experience with level design in games like Halo? It might do you some good to read up on making entertaining levels; I want this game to be great. http://www.ongamedesign.net/designing-fps-multiplayer-maps-part-1/ https://critpoints.net/2018/02/18/good-fps-map-design/
Egiles and I have been doing a ton of reading trust me.
The hardest thing I think will be creating a map that's small enough but looks realistic and not blank. Might have to make parts of the map fenced off out of play areas.