4507R chassis means you have SupII+ and above. This type of supervisor is capable of layer 3 without doing anything other than making sure ip routing is enabled.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_31s/conf/l3_int.htm
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_2_31s/conf/sw_int.htm
As for DHCP Server, see the following sample config:
ip dhcp excluded-address 192.168.1.1 192.168.1.99
!
ip dhcp pool private
network 192.168.1.0 255.255.255.0
domain-name anydomain.com
default-router 192.168.1.3
dns-server 68.87.76.178 68.87.66.196 192.168.1.99
lease 3
The above are self explanatory.
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