Running fretta


I’m quite new to the whole Fretta gamemode, but anyway. I’ve decided to start running a server with fretta gamemode and 32 slots. However, due to my knowledge with this gamemode, I haven’t managed to make anything much.
So, I’ve got few questions and would appreciate any help regarding to this.

I found few fretta gamemodes, such as Cactus v2 and CrateWars. I installed both of those to the server, but straight away I found the problem with no maps. So are there any official fretta maps I should use for certain fretta gamemodes or do I have to make those myself? Also what would be the most popular gamemodes for fretta?