Reforger Where to start creating a MP gamemode

Question I am completely new to the modding scene and im trying to make a new multiplayer PVP game mode for refoger. basically short 15 minute matches focused on small squad vs squad combat where everyone has only one life, but as a newbie i have no idea how to go about it. So which articles, tutorial videos, etc shoud i read to start getting my feet under me and figure out how to make this game mode?