DHCP is needed in networked multiple pc where the router assign the the ip to each pc automatically. U don't need DHCP if u manually configure each pc ip...
(hehe i'm only know about DHCP at that far, for more depth ask the other....).
Your connection likely a home not public. but u doesn't need to worry about it, home network has more loose security and restriction than public network.
u can manually configure it later to suit your needs.......