1. What should I make on Step2? - as high as you can, take it early so that schools get your score by the time you interview
2. Will my step1 score completely hinder me from getting an interview? - at many places, yes. unfortunately
3. What else do I need to do? - do 2, maybe 3 away rotations if you can. don't rotate at programs that have a reputation of putting emphasis on numbers as this may be a waste of your time
good luck to you