Do I need to tying up these loose ends before I start my first deal?

[Yolando Allen]

I have started my business. I have a business license, business cards, I have some bandits signs in place and I have car magnets on my car advertising my business. I also have some buyers who are ready to buy, but should I delay putting together a deal until I have a business bank account? Also I am working with a real estate broker who has some deals my buyer might be interested in on the MLS how do I negotiae those deals with her to ensure my company gets paid and the broker doesn't steal my buyer and cut me out of any future deals.