Auto cad who know how to set up a long, 50 meters, 20 meters wide of the page

For example, I need to do a building plan:100 meters long, 80 meters wide.CAD, in how it is set up.Graph in the work area so that all can be displayed.CAD is currently the general importation of 5 m in a straight line after the narrow window in fully Display.100 meters but could not completely show it on.I hope well-intentioned professionals give me some advice.Thank you,

input Z In the losers in the S lost 0.01 set scale.CAD showed that many numerical decimal places, you have spent enough to fully display! If you can not see for the time being, you can enter Z, and then enter A can see the whole map.You have to 100 painting of a long-term and wide-80 on the input @ 100,80 on the line.Click on the drop-down menu “format” – “unit” – to set the ratio of drag and drop “m”.
Use “LIMITS “(Limits of the graphic) to set the boundaries of graphics, such as 297420 or 420594