oist kabayan!
worry about scale issues later for printing (layout tabs). all you have to do is to draw everything in a 1:1 scale, i.e. 1 drawing unit = 1 mm, 1000 du = 1000 mm.
say, if you want to draw a 4m x 6m rectangle, you input 4000 & 6000. and if you want to go on details, you have 1 du for 1 mm. this way you may have large and small drawings in model tab.
when your drawings are done, switch to layout tab where you will have a preview of the paper size you're gonna print. use MVIEW or MV command to put viewports. double-click insie a viewport then zoom/pan on a part of the drawing, say a floor plan. center on the plan then use ZOOM again then type 1/100xp for a scale of 1:100, 1/50xp for 1:50, 1xp for 1:1 and so on.
hope this helps
erona