First one is for manga-studio.

I want to make the lineart and panels for my comic in manga studio, which is going fine and dandy. I know how to do that just fine.
But I'm not sure how to save or export the file out of manga studio, So that I can colour it in photoshop.How do you do this?

Second one is about paper.

What are the dimensions of a standard piece of office printer paper?

Thank you for your time.

8.5" X 11" Although you'd probably use some of that for margins.

Having never used the software, I'm not sure as this will work, but here's what I'd try.

Click on file at the top left. Does it have an export feature? If yes, hover over or click on export. It shouyld give you some options. You'll want to export it as a file PS can read. Try several different file types till you get one you like.

If it doesn't have an export feature, try going to "Save as..." most img editing programs have one. See what options it gives you.

PS can use these img types:
GIF,JPEG,PSD,BMP,TFF,PNG

and probably many more

good luck!