What statistical ysis do I use? (psych research)?

I'm writing a research proposal paper, and I'm not sure what statistical ysis method I should use. The proposal involves investigating whether or not the use of parental harsh discipline leads to the onset of childhood OCD. So far, I basically have that the participants will include 40 pediatric OCD patients and a healthy control group of 40 children. Both the clinical and nonclinical sample group of children will report on the kind of discipline that they have been subjected to by their parents using a self-report questionnaire (or maybe an interview, i haven't decided yet). Anyway, I'm just not sure which statistical ysis to use to compare the data from the group of kids with OCD and the group of healthy kids in the control group to show the difference in the abuse used by the parents of the kids in each group. Any advice would be great, and if you have any other ideas, feel free to add them..i'm an undergrad and eager to learn :) Thanks!!