DHCP sever available, DHCP lease available on the client computer

HI,

I am a network technician beginner, i made a small network
connection of tree computers. I want to make the DHCP
service available on the sever so that i can assign the IP
addresses automatically, i also want to know how to make
the DHCP lease available on the client computer ( win98 )

I also meet some network vocabulary that i think myself i
did not understand them correctly and i want a short,
clear explanation for them. they are:
Recipient of IP packets, network ID, subnet mask.

I also want to know how to configure internet explorer or
microsoft outlook to use internet service with windows98