Need suggestions for a major document conversion task

As you all can tell, I am a complete newbie...
        
I have four 3-ring binders with about 3000 pages of xeroxed documents which were
originally typewritten or hand written letters generated circa the 19teens or
20s.

I want to scan these, run them thru an OCR scanner, digitize, store on HDD or on
CDs.  The handwritten might best be done as interlinear format if possible.

Do I want a scanner to do this?  if so, which one and what software?
OR, do I want a service to do this?
if so, suggestions and cautions??

thanks
chas