Model space is model space.  Everything there is drawn to true scale whether it's in nanameters or parsecs.  You use viewport scales in your layout title blocks to control how much, or how little of model space you see there and eventually plot out.

 

Create a truly sized A3 and or A4 title block drawing for yourself in model space.  Get everything in there you want.  Put the lower left corner at 0,0 and then create a block out of it.  Attribute the daylights out of it if you want.  Use Fields too.  When you've got it the way you want save it and insert it in one of your layouts at 0,0.  Then test it like crazy.  Include your standard layers, linetypes, anno and dimension (table too) styles, the works and save it as a DWT (template).  You'll be well on your way to what you want.  Update it as you find things you want included or not.

 

We were all new once.  Don't sweat it. 

 

Dave.