First and firemost congratulations and welcome to ZARP Staff Family! I hope you enjoy your time being a staff.
Here are the commands that you can use:
/back <playername> : You can use this command to tp back players and yourself to their previous location. Use /back <playername> to tp a player back to his/her previous location. Use /back to tp yourself back to your previous location.
/bring <playername> : You can use this command to bring players to yourself. I dont suggest you to use this much because it blocks you to use /back command properly but if a person that you are trying to teleport is dead, try this command.
/teleport <playername> (alias: /tp): It helps you to teleport yourself or other players. If you use /tp, it will tp you where you were looking at. If you use /tp <playername> it will teleport the player where you were looking at. (If you use this command instead of /bring, it'll help you to use /back on players properly.)
/goto <playername> : It helps you to teleport to a player's location.
/freeze <playername> : It helps you to freeze a player if he/she is trying to run away from you or if he is propspamming.
/slay <playername>: It helps you to slay people and even yourself.
/warn <playername> <reason> : This command is to warn players who are breaking rules. If a person gets 3 warns in a row, he/she gets kicked. If he/she comes back and completes the warn count to 4, he/she gets temporary ban.
And there are also some commands that you can use via TAB. You can unban people from the jobs which they were banned, you can tp players to spawn by selecting Back > Spawn.