Setting up drawing boundaries for site plans

Hi,

I am relatively new to Draftsight and CAD.  I want to draft a site plan for a building, but it seems if I set my drawing boundary to the sheet size, I get on a a few inches on my dimensions.  Where can I set the scale for hundreds of feet when only using say a 22x34 inch drawing boundary so I get the proper dimensions?

Or do I set the drawing boundary to several thousand inches and draw 1:1 in the model area?

 

Mark