Need Gamemode Server help??

Sorry if im in the wrong section if i am please tell me dont cause a riot and start calling admins just tell me!!

Ok i want to start b saying im an idiot and i need someone to tell me how to change my gamemode by gamemode i mean the one that shows up when i put my server online.

For some reason it says sandbox??? anyone know what to do??

I want to make it dark rp.

One way to do it is “changegamemode rp_downtown_v2 darkrp” in console. I may have the map and darkrp backwards, but I cba to check.