For (1) —
I've a PDF (letter page size/portrait orientation) of some length on my Kindle.
After rotating the screen presentation I've no problems using the PDF.
If "actual size" is selected Kindle's magnifier can be used.
Keep in mind that some facilities associated with Kindle viewing of the Kindle eBook format are not going to be available when view the different file format that is PDF.
You might want to consider picking up a Kindle (perhaps a 'gently used' one) so that you can actually view your PDF(s) on a Kindle.
Note that interactivity, such as links within pages or from Bookmarks is not support.
One can view/read only at this time.
The Kindle Fire might do more - don't have one so I cannot speak to that.
For (2) —
You can use Acrobat to establish "security" for a PDF or to require a password to open a PDF.
Problem is document security can be circumvented and what's to prevent someone from passing around the password?
The only effective way to really "lock-down" a PDF is to apply a DRM solution.
Not always economically feasible for an individual / small shop publisher.
For (3) —
Just a thought. As this is your first foray out to town (as it were) you may want to give consideration to initially provided the eBook in Kindle format to the Kindle store.
Look over the self-publishing scheme provided. Idea is to get a product, with adequate protection of your intellectual property, on the street to see how it fairs.
Hopefully, the coffers will begin to fill. That provides revenues to support other avenues.
Example: InDesign CS5.5 to master content. Output routes are available to iPad, Android Tablets, Kindle, other eBook readers.
With adequate revenues in hand DRM for the eBook(s) (PDF or ePub) becomes viable.
For "one last thing..." —
Adobe Reader cannot configure a PDF for Initial View. You must use Acrobat. Configure the PDF's Document Properties.
In the Document Properties dialog there are some tabs. Open the Initial View tab.
You can establish a setting for "Navigation tab" - select "Bookmarks Panel and Page".
Thank you for the reply it was thoughtfully done and I appreciate it. Of course it does beg the question of what are you doing answering a deadbeat like me on a Saturday? I guess only someone answering the post on Saturday could know the answer to that and it ain't pretty!
Just taken a break from painting the ceiling.