If you dhcp server are set up property then any computers configured to get there IP address via DHCP shoud just find the server and get an IP. Please provide more information like:
Is this a windows or unix network?
Do you have a domain controller?
What OS are the clients using?
DHCP is i protocol who is support Rfc 1542.when you computer send a message for ip address to dhcp server dhcp return in two way rfc accept or noon accept. dhcp have a logical part is scope. You should be config dhcp scope. You should configure a scope with reserve for your domain