I believe I have heard others in the Guild say 1 mile sqaure cultivated land for 180 people (Neonknight most recently, I believe). Even for 60, I don't know that you'll get it all in one map. As for buildings, services, etc, you might refer to Domesday here;
http://www.rpglibrary.org/utils/meddemog/
Just checked above resource, it seems the only thing that Domesday Book is certain about being present are 3 Clergymen (even 1 armed agent of the governing power has only a 67% chance of being present). It has its limitations, but it's a fun resource to look at.
Nice start, btw,