heya' all, first post and a many thanks to the masters and mods and posts here.

I have some technical questions about buying btc. Some of the goals of these questions are to familiarise myself with btc in its different methods including buying from different sources using different methods.

From spending a tonne of time through these and other pages my best option atm is to hold. I'm prolly a bit late for mining on my sons old 2GBgpu SLi rig although I may still do that just for the exercise.

I am using paper-wallets

Question 1.
Am I correct thinking when I buy over the counter in Australia I only need to take in my public wallet address?

Question 2.
My printer has run out of ink, how do i take my PK in now? (I would rather spend money on bc than ink)

Question 3
I have several wallets saved on a usb and i have several public key address from the first usb's wallets saved on a separate usb. I did this with a live disk on a machine that is not used for internet, has no network connections. Do i take the usb text file for otc transactions? I could also save the QR code as an image on the usb but this seems to involved using graphic programs and so forth...

Question 4
Even if i had ink and printed the wallet it would print with the private key. How do i go about trusting when handing that over to a teller or atm and keeping the pk key hidden?

many thanks for any help... i feel im not "getting this" but can see how some ink would be beneficial...