Before you can use commands, you should know what a CVAR is. CVAR stands for control variable. CVARs consist of 2 parts, the control item, and the setting for that item. For settings, 0=off and 1=on, and some accept any number (time limits, and start money).
Example: mp_friendlyfire 1
The mp_friendlyfire is the control item you are setting, and you are setting it to 1 (on).
Player Management Commands
rcon kick kicks player with certain username (for long ones, cut and paste from console)
rcon banid Ban a player with a certain ID (found in rcon status) for a time in minutes.
rcon status Prints the servers status, and players status in console
Map Timelimit Commands
mp_maxrounds 30 Sets the maximum rounds played to 30
mp_winlimit 60 Sets the map to change at a team winning 60 rounds
mp_timelimit 35 Sets the timelimit before a new map is played
mp_fraglimit 50 Sets the max frags a player can have before a map change
Server Operation Commands
rcon sv_alltalk 1 Allows all users to hear eachother over voice chat.
rcon mp_friendlyfire 1 Sets friendly fire on. Players can injure teammates.
rcon mp_hostagepenalty 12 If this many hostages are killed, the player is kicked.
rcon sv_password fishy Sets the server join password to fishy. To turn off, sv_password ""
rcon mp_flashlights 1 Turns on the ability for people to use flashlights.
rcon mp_restartgame 5 Restarts the map, including kills money and scores.
mp_roundtime 1.75 Sets the timelimit for each round in minutes.
mp_startmoney 16000 Sets the money each player starts with to 16000
mp_fadetoblack 1 When a player dies, he cannot see the rest of the round.
mp_buytime .5 Sets the time you can buy items after round starts in minutes.
mp_tkpunish 1 Kills team killers at start of the next round.
mp_autoteambalance 1 Automatically balances teams.
mp_limitteams 2 Sets the max # of players difference between the teams. (One team can have a max of X more players than the other team)
mp_c4timer Sets the time the bomb beeps before boom in seconds. mp_footsteps Sets if players can hear footsteps
mp_freezetime Sets time you are frozen at spawn before you can move in seconds.
mp_chattime Sets the time the scores are shown at the end of the map in seconds.