Help With GameMode on My Server Please

I run my own dedicated server that i play on with a group of friends, we have only played sandbox on it as of yet, but would like to play the game-mode Flood. I have installed correctly( i assume) and when i launch the game-mode and Flood level, we start with Smg and basic weapons. No countdown or spawn menu. If someone could please help, it would be very much appreciated. Cheers.

Have you changed the command line?

sorry can you be abit more specific, were would/do i change it. Thank you for your fast response, sorry for asking a daft question. Cheers.

EDIT: Can someone please help, Thank you