Should I say ‘for’ or ‘with,’ ‘enthusiasm’ or ‘with enthusiasm’ in the given sentences? Is ‘established’ correctly used?

Should I say ‘for’ or ‘with,’ ‘enthusiasm’ or ‘with enthusiasm’ in the given sentences? Is ‘established’ correctly used?

1. Jason, my employer, repeated the question “Who would like to clean the office?” (for, with) emphasis. He spoke with authority and (enthusiasm, with enthusiasm) and established himself as a real boss.
2. When she spoke, Hannah used hand gestures (for, with) emphasis.