How to change starting map of my dedi server?

I tried changing through command line but whenever I did I couldn’t find my server on Gmod any more.
What do I do?

That means that the map is not installed correctly, most likely.

Did you upload the map directly or through workshop?

I was trying to change is to a CSS map. Where do you suggest I buy and install the map

Which map?

And did you mount CS:S?

‘Mount’? and I was using office

He asks if you have CS:S downloaded and mounted on your server?

hopefully that’s it sorted. man I was hoping making a server was easier

It’s much harder then you think.