Need help with this scripting.

[HoyChampoy]

If I understood your question right, you want to use a part of the callback only once, and the rest allways? If so:
1 option is to make a local variable, which is set 0 in OnStart(), the stuff you want to happen only once gets an if statement to check if the variable is 0, and inside you set the variable 1.

Im sorry im a n00b when it comes to this. How would that possibly look like?