Whether or not the drawing was created in regular ACAD doesn't matter; ACADE is just regular ACAD with a couple of extra functionalities. Whether or not you see the XY axis is a display setting stored as a drawing variable.
I'm not sure how you are supposed to change the units of the source drawing as mathalekar suggested -- the UNITS command doesn't include such an option. All you can do is define what unit to use for inserting blocks into that drawing.
As for not all of the objects appearing...they're probably there, it's just that your drawing's limits are too small to show everything. Try to do a zoom extents. Double click your mouse's scroll wheel or type in ZOOM on the command line followed by E for extents. Can you see everything now?
What it sounds like to me is that you are working in Imperial (English/standard) units while the objects you copied were drawn in metric. This happens frequently with ACADE, all you have to do is scale things down to be the right size. The scale factors between metric and english are 25.4 (when moving from english to metric) and .039370079 (when moving from metric to english). I'm willing to bet that if you scale the things you inserted by .039370079 they will end up closer to what you want (if not exactly).
Hope this helps,
Jim

Jim Seefeldt
Electrical Engineering Technician