Well, my goodness, newstamper! Congratulations on becoming a demonstrator. Now to your questions......
Let's see...show a technique? Yes, but that will take care of itself. If you look in the technique booklet that comes with every customer order....you'll see lots to work with there. Starting with 2-step or heat embossing is great.
Card samples....if you have any of the winter catalog sets...then yes by all means make some samples to show or make-n-take. If not then use what stamp sets you have.
I don't charge for any workshops...and the guests get to do 3 make-n-takes. As a former customer, I loved using the products and taking home something I made.
Have you been to many workshops as a guest? If you put in your name and address in the demo locater on the stampinup.com site, you would probably find some demos right in your neighborhood. Maybe one of them would adopt you.
If you have your demo number then you can access the stampin up demo site and find lots of workshop help there also.
In the meantime.....this site will give you lots of sample ideas and be sure to join the demo forum area for workshop help.
//www.splitcoaststampers.com/forums/groupcp.php