To succesfully add a map on your csgo server , you must :
1) add your map , on csgo/maps folder
2)(ONLY IF you use sv_downloadurl command and owning an http(s) file server, otherwise , skip this step) bz2(bzip) the map and add the bz2ed file on your fast download server , maps folder
3) Edit mapcycle.txt (add name of the map there , without .bsp extension)
4) Edit gamemodes.txt or gamemodes_server.txt (add the name of the map , in the appropriate mapgroup your server is using , BEWARE , SERVER MUST BE RESTARTED FOR THIS TO TAKE EFFECT!!!)
5) add map_name.kv file on csgo/maps folder (this sets the player skin for each team. BEWARE , SERVER MUST BE RESTARTED FOR THISTO TAKE EFFECT!!!)
6) add map_name.cfg file on csgo/maps/cfg folder in order to have specific settings to fire for this map
7) (optional) take the map_name.nav file from your server , bzip it and upload it to the fast download server , in order for clients to download it and not be delayed (only if you use bots , you will need .nav file)
here you will see all available csgo skin settings to use for your .kv file.