VB.net, SDK, connect to ZD420, print/fill out label templates

Hello all!

I just bought a ZD420t label printer that we want to use in our company.

We already have a printer (other brand) that I can access via an SDK and I've written a VB.net software to load a label file and fill out the variable text fields and also QR codes.

Now I want to do that using the ZD420t. I've created labels and named the all elements I want to fill out using my VB.net software, installed the zebra.printer.sdk - but how do I open the printer (USB, NOT LAN), load the label and submit the data to the the desired elements?

I looked at the code examples, but I don't know any C language, I also don't find how to access/connect the USB printer or load a label.

(the other printer I mentioned had vb.net examples available and it was really easy to achieve results in no time)

Can anyone point me to the right direction or show me examples of how to do that?

I've already searched the community, googled for hours, but now  I am kinda desperate

Many thanks in advance,

Robert