Line weight configuration for printing.

Hello,

I am relatively new to Microstation and I am having trouble printing my work for University. My tutors didn't explain much about the printing options in the program and I don't know how to set the desired line weight for a layer when printing - for example, I'd like that the 0 line weight to print as 0.05 mm on paper. I have been told that the line weights in the design file are preset and can't really be changed, but if that is so than I can't really print my work properly. 

If you could please take me through the printing options I'd be very grateful as the final submission date is around the corner and I can't get my head around this isssue. I am attaching the file I am currently working on. I should mention I am using the student version of Microstation.desfasurata pietei 1 problema linie in vedere.dgn

Thank you in advance,

Claudia