Yes, I used concentrated phosphoric acid for the reaction.
I know the mechanisms of the formation of 1-methylcyclohexene, 3-methylcyclohexene and methylenecyclohexane, which make up most of the product, but I don't know how to get the others.
No, I don't know how to draw any ring contractions. Are there any resources I can use, or would could you explain how it works?