How do I set up commands to use parameters?

Hello, first and foremost thank you for clicking this thread :)

I am trying to set up a command called /guild "Join" "Mining"

I then want to apply a entity player NBT tag to the provided entity but we will get to that latter.

The command I have set up just holds "/guild" but I feel like I am missing some extra steps on using parameters.

Do I need to use variables, or is there some kind of special thing that has to go into the command field like "/guild <0> <1>"

Below is my event and command screens on how they are set up.