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1. You are correct.
2. Again, you are correct, but for industry standard, (those of us doing the testing), if there is a line, we shouldn't waste our time and our client's money by forwarding to a lab.
3. It doesn't matter, again you are correct (3 for 3 so far) in that you shouldn't give the first void of the day.
4. They are not required to give details about the drug testing program unless you are DOT regulated, in which case, the policy is strictly regulated as to what info it must contain.
5. It isn't necessary, but to insure you can pee on command and not waste an hour or two at the collection facility, 1/2 the dilution is an awsome idea.

Thanks for doing your homework!

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