More than I can bite off...

[Bill.Light at kp.org]

I've probably got too big a bite to chew (and no bark to follow it up)...
Situation

I have a working DNS for my home domain and two virtual domains.  A friend 
of mine had the youth soccer site hosted with another guy that left the 
area (with his DNS).  I said, no problem, I could host his DNS.  Except, 
now, it's not obvious to me...

The web:

My domain/name server:    dns1.my-home-domain.com
 
The soccer domain   http://www.geocities.com/Colosseum/Bench/5991/

Question - what do I need to add to my name server, so that www.hysl.org 
points to the soccer domain? My friend has control with the registrar to 
change the name server to point to me...but I'm now unclear if I can do 
just DNS...  Suggestions ?  What do I need to do, what does my friend need 
to do ?