JHut,
The proper signal for a throw-in designated-spot violation is listed on page 75 of the NFHS rules book. It is signal #21. It involves pointing at the spot and then pointing over to where the player ran. This is also what you should use when a free throw shooter steps over the line.
Now your question #2 is not a violation. It is either a no call or a technical foul on the player for leaving the court for an unauthorized reason. You must decide if the player got a significant advantage by running out of bounds for those 10 feet. If so, it is a T.
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