Hi Juan,
The main difference between the 5505 and the 5510 or higher is that the 5505 has switchports and VLAN interfaces. The 5510 only has L3 interfaces.
Configuration is similar to a L3 switch, here’s an example for an INSIDE and OUTSIDE:
ASA(config)# interface vlan 100
ASA(config-if)# nameif OUTSIDE
ASA(config-if)# security-level 0
ASA(config-if)# ip address 192.168.1.254 255.255.255.0
ASA(config-if)# no shutdown
ASA(config-if)# interface vlan 200
ASA(config-if)# nameif INSIDE
ASA(config-if)# security-level 100
ASA(config-if)# ip address 192.168.2.254 255.255.255.0
ASA(config-if)# no shutdown
ASA(config)# interface ethernet 0/0
ASA(config-if)# switchport access vlan 100
ASA(config-if)# no shutdown
ASA(config-if)# interface ethernet 0/1
ASA(config-if)# switchport access vlan 200
ASA(config-if)# no shutdown
The 5505 is the last ASA that uses these switchports and VLAN interfaces, the 5506 has 8x L3 interfaces.
Hope this helps!
Rene