Digital BW, The Print

Would someone take a moment and run me step by step through the 
printing process for a 13 x 36 inch or mm/cm equivalent panorama off 
a roll? I'm trying to print  6 elephants racing towards a water hole 
in B & W!

I have made a couple of aborted efforts, on chopped off both ends 
and the other two printed off center and only partially.
In the Print window I select roll not manual roll, manual roll is 
for a feed through the front?
Do I use the banner or cut sheet mode?
If I use Banner do I tick "save roll paper option?"
If I use Cut sheet mode do I tick "print page frame option?"
I have to set the custom page size; I can either use 0.01cm or 
0.01in,
Does 13 inches become 1300 inches and 36 inches become 3600 inches? 

I really could use a step by step how to here, papers too expensive 
to keep making mistakes….

Many thanks from Namibia