Use the Styles Manager palette (via tools menu) to handle dimension styles.
Units cannot be standardless they must be either Metric or Imperial.
No you cannot just copy and paste - unless you own AutoCAD. There is no way to get ALL line styles and fonts. However, you will get some fonts if they are embedded in a drawing, and all line styles are effectively embedded in any drawing in which they are used. Otherwise it is best practice to use standard TT Fonts at all times - even in AutoCAD.