Pretty new to Minecraft online...chat help

We (me & my kids) are quite new to playing Minecraft online. I've seen to the commands to talk to a specific player, but can you speak to all players nearby? I tried /ch but it didn't work. I also tried /channel list but nothing came up! Just wanted to say a hello to everyone online at the time

 

There is no way to speak with more than 2 players privately. To talk with 2 players do /msg (player) (your message here)

 

Do you mean on all the servers, or just the one you're on?
If you want to talk to everyone on the current server you're on, don't type anything in the /whatever. Just press T and say what you want!
If you mean the WHOLE entire Sandlot at once, I am sad to say that there is no way to do that unless you're a moderator (don't go asking to be one, they'll say no- they choose who gets to become them!).

 

http://www.sandlotminecraft.com/index.php?pages/commands/

To see the list of commands, visit this page ^

 

thank you for your replies! Yes i was just talking about the server i'm on.