https://www.dinklebergsgmod.com/site/Thr...light=Bind
This will help with creating binds to do callouts in text chat for different things (traitor, innocent, suspicious, etc.)
As for understanding the gamemode itself, if you press F1, there is a basic tutorial on how to play TTT. F1 also has settings you can enable/disable, as well as a button to move you to and from spectator.
F2 allows you to mute living players, dead players, all players, or no players by pressing it to toggle through.
F3 is the pointshop for skins, weapons, crates, etc.
F8 will show you damage logs, but regular players can only see the logs for the current round they are playing once the round is over.
Tab will show you the scoreboard, and if you click a name you can select "friend, suspect, avoid, kill, missing" to help you remember who to trust and who to watch out for. If you go all of the way to the right of a person's name in Tab, you can clientside mute their voicechat.
X is for global voice chat. Y is for global text chat.
Left shift is used to talk to Traitors in voice chat and U is used for Traitors or Detectives to talk in text chat.
C is the menu for Traitors and Detectives to spend credits that they have for various weapons and useful items.
Q is to drop a weapon you currently have out and you walk over a weapon to put it in an empty slot (2 is your secondary, 3 is your primary, 4 is a grenade).
R is to reload your weapon.
F is your flashlight.
Ctrl is to crouch.
Spacebar is to jump (holding spacebar when you jump with a jumppack will help prevent fall damage).
Note that these may vary player to player depending on what they have individual keys set for, but these are the preset standard keys. As for the staff stuff, I could explain it but it might be easier to ask a current staff member.