Print PDF document made iTextsharp and set printer setting

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VB

itextsharp

Hi, a few days I'm trying to use the itextsharp library and it seems very well done and above all fast.
I created a document composed of rows and tables but now I find myself facing 2 difficulties ....

1) Send the document to the default printer
2) Automatically set from VB code that the document is printed not adapting it to the printer but keeping the original dimensions

I tried but unfortunately I could not, neither to change the settings nor to print the document.
Already there I propose a last problem ... I have documents in pdf not created by me that have a watermark inserted ... I would like to capture that watermark, save it in a picturebox in the form and then, when I create the pdf with itextsharp I believe the sheets of the document with that watermark in the background of the pages of the document.
It's possible ?
Thanks for the answers.
Best regards.

Andrew

What I have tried:

Every things but .... nothing.