This post explains general steps to make a simple playable Counter Strike fightyard map. You can learn the details at Superjer
Put cstrike in your Counter Strike 1.6 or Condition Zero installation folder.
Valve Hammer Editor or QuarK (Quake Army Knife)
info_player_start (CT Spawn)
info_player_deathmatch (T Spawn)
light (self explanatory)
Note: By default, we can’t play Counter Strike in Deathmatch Mode. Google for CSDM plugin.
Download the map and project file here