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)
func_bomb_target (bomb location)
To define the size of bombsite, please follow these steps:
Make a block brush, cover it with ‘AAATrigger’ texture(included in rmf and map file). Click the brush. Press Ctrl+T (Tie to Entity). Choose func_bomb_target. Done😀