If there are no other aircraft in front of you, then you enter the runway and Line Up, and Wait. The Wait is for any other traffic to get clear your intended flight path.
If there is an aircraft in front of you, it is advisable not to position your light Cessna aircraft anywhere near the tail of a Commercial Airliner, as the Jet Blast will flip you over even from 200 yards behind.... It is most likely that ATC would never request you to do that.
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