For your RQ, you need two variables. If you compare those with ADHD to a control group you would have a grouping IV. See if you can then fit your RQ into this format:
Is there a difference in DV based on level of IV?
The scale you select to measure attitudes must be a known scale from literature (with psychometric properties). See if you can find one you would like to use and go ahead and tell us what it is and called.