configure terminal
interface Ethernet0/3
switchport access vlan 3
int vlan 3
nameif management
ip address 192.168.1.1 255.255.255.0
management-only
no shut

For ssh access:
ssh 0 0 management
crypto key generate rsa modulus 1024

For telnet:
telnet 0 0 management
aaa authentication telnet console LOCAL

For ASDM:
http server enable
http 0 0 management

Documentación oficial:
http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/access_management.html