Start Lan Server with Console

My “Start New Game” button (on menu) doesn’t work in Gmod. And I want to make a lan server.
Is there any console commands that would make one? Like, I can do sv_defaultgamemode and map to start a singleplayer game, is there a way for a multi one?

What’s not working about the Button. I know what you mean, but since when, since what?

Here’s an article on creating a LAN server: https://support.steampowered.com/kb_article.php?ref=5452-TASB-6078

re-install GMod if your menu is fucked…