How Many People for a KnowledgeBase

Context:
We are now looking into creating a knowledge base in a form of an Intranet site to cover beginner’s basics: elementary operations with a computer running under Windows 2000, working with Word, Excel.
We are currently thinking of very short documents (notes, rather)written in very plain, if not openly childish language.
Question:
Could anyone please give me an idea of how many people would be necessary to prepare materials for it? The task is to cover the main points only, but to make the base ready to make it open for the staff (containing the materials covering most of the basics) within some 3 months from the beginning.
I always rate answers. Please, bear with me, for this question might be left open until mid-September.