How can i use a dll, from the beginning

I know that this is a very simple question, but i really need help to improve myself.
I want to use the functions in a dll (dll for openssl) from VB environment.
The problem is it has lots of parameters that are not supported by VB (pointers, pointers to functions) so i cannot convert them.
How can i use VC++ (5.0) to call these functions from high-level, will MFC will be useful for this thing.
What are the functions to be used etc, or u have an URL for these?
thanks to anyone who reads