Digital BW, The Print

Hello,

I've got some VFA to print on, and I need to know which is the printable
side.  One is cleaner than the other (smoother texture) and whiter.  This is
the side I assumed I should print on.  The first print is coming through the
printer now and I can see some runnning of the ink along the edge of the
print.  I did use -5 for ink density..should I have used more?

What size do you print your final prints when printing on 13x19 paper?
Assuming a 3:2 uncropped image, could anyone share what print size is
considered the standard and what the TOP and LEFT margins should be (for
optical centering)?

Any help is appreciated

Guhan