Is the client the dealership or a competitor? I ask as if a dealership only provides limited information, then the client should not ask for something that they do not allow to be provided.
As for stating you have your own financing secured, I think that is a very bad idea (unless the guidelines allow it). I say this as dealers make some extra money on financing. Any information that a shopper provides, that lets the dealer know they will make less money, means that the price they quote will not be as low. To that end, the better buyer guides clearly tell buyers to indicate they are going to finance and will be willing to take advantage of what the dealership can offer them. (Just remember, since you are not ready to buy you are not ready to fill a credit application out). Just say you have excellent credit, financing is not a concern (again unless your guidelines require something different).
Leases are not easy to run, hopefully as a buyer you have a lease versus purchase scenario ready. A good one is a 60-month loan versus their current lease promotion. If you have to state that you have money down, tell them you plan to cover the tax, tags, and processing fee plus any extras you may decide on; for both quotes. If they mention anything about an extended warranty, or other stuff, just inform them anything extra you decide on you plan to pay for up front, you are prepared for that.
Hopefully there are no scenarios that require you to state you are "buying today if the price is right." If that is what the sales person asks, just inform them that if the price is right, then there is a very good chance that you will be buying the car within 24 hours. I find it is better to be comparing different makes and models as an excuse to not decide right away. Price is not your motivation, the overall best value that also meets your needs the best is your motivation. Again, all of this has to fit into your guidelines.
As for your drivers license, that is only required if you are going to drive the vehicle. My company now gets a copy if we do a trade appraisal, to prove whom is authorizing us to drive the car for appraisal, and of course if we run credit.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson