[CentOS] Getting started with NFS

Hi,

I've never been using NFS before, but I'm going to need it. I gathered 
some documentation (Deployment Guide, RHEL 5 Unleashed, general NFS 
docs) and I have a few machines to experiment with.

After about two hours of reading and experimenting, I must admit the 
documentation is confusing, to say the least. Although some step-by-step 
tutorials are provided, none of them work. For example, the RHEL 
deployment guide mentions NFSv2, NFSv3 and NFSv4... but as much as I 
poke around, I don't even find a way to checkout which one of the 
version I'm running.

So...

1) Can you suggest some reliable and well-written (think: 
newbie-friendly) documentation about NFS?

2) Usually I start out from a minimal install on desktop as well as 
servers. Which packages are needed on the servers side, and on the 
client side, in order for NFS to work correctly? None of the docs 
mentioned above says a word about it.

Thanks,

Niki