What to ask and when?

I'm looking to buy an established business and I've never done it before. I reached out to the broker and they had me sign a confidentiality agreement and then sent me out a financial information pack with the basic numbers (expenses, profit, lease conditions etc). Then I said I wanted to know a bit more and sent back a while bunch of questions like 'will the current staff stay on after purchase', are there any contacts with suppliers I need to honour, what equipment specifically is included in the price, questions like that. About 10-12 of them and haven't heard back. I'm wondering if asking questions like that is proper procedure or not? And if not, what kind of questions should I ask and when?