FL is just a stupid troll mod. It was made just to mess up the whole half-life. Don't have fun playing it.
2.1 will have bots.
These are the commands you should know when its out.
bots_enable <1/0> - enables the bots
bots_client_override <1/0> - Override the command
addbot - Adds a simple bot into the game
observer - Bots will observe/specate
botskill - Bots skill level (higher number = smarter/harder bots)
botdontshoot - Makes so that the bots cannot shoot for shit