Time out mechanics

[PP]

I would like to know what is the proper time out mechanic for NF. I was at a provincial tournament and all the experuience officials had different mechanics. I was confused ? In our association the referee that calls the time out 30 or 60 must report the time out to the scorer. Then his/her partner must be at the position for the throw in with the ball. When the first horn goes the referee without the ball indicated with his/her index "First Horn" to the teams so therefore when the final buzzer goes everybody is ready to resume play. Now some referees piggy back the time out, some change positions, some do or don't indicate the first horn and final horn... All I would like to know is the proper mechanic for time outs...thanks