If standalone, you have to do it how you did with old vb6.
If you check in:
C:\Program Files\<your acad>\Sample\ActiveX\
you should find some info.
Also search for interop around here and you will find how to start acad up from external app.
You cannot plot without opening the drawing in some form of session. It may be hidden or whatever, but acad does a regen (of display list) when it plots, so no dbx style plotting....