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Cisco 1801 Interfaces - using interfaces to route traffic

I am using a Cisco 1801 router. It has the normal FE0 plys FastEThernet1-8 interfaces .

Can I utilise the interfaces FastEthernet1 -8 ? Will the 1801 then manage routing of traffic.
Do I need to assign each VLAN to a separate FastEternetX or will the 1801 manage this and route accordingly ?

So I am using FE0 as OUTSIDE and want to simulate customers connecting via the internet to a service by IP address. This service will sit on a server in a VLAN "DMZ" which ideally I would to plug into one of th FastEthernetX interfaces. Do I need to assing an IP address to each one of the Physical interfaces or will 1801 know what to do with it having traffic coming in from these interfaces ? How do I assign or do I not need to assign an interface to a VLAN ?
Hope this makes sense.

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8/22/2022 - Mon

Create a VLAN and assign a ip address/subnet ; after that you can assign the interfaces to that newly created VLAN.(by adding "switchport access vlan #" to that interface). The route to the internet is being setup by the "route" command.

so to give you an idea:
interface Vlan1
 nameif inside
 security-level 100
 ip address
interface Vlan2
  nameif outside
 security-level 0
 ip address
interface Vlan3
 nameif dmz
 security-level 50
 ip address
interface Ethernet0/0
 switchport access vlan 2

interface Ethernet0/5
 switchport access vlan 3

>> by not setting a switchport, other interfaces will be in de VLAN 1 <<
Nayyar HH (CCIE RS)

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Nayyar HH (CCIE RS)

vlan 10

vlan 20

Then via access-list I control traffic into OUTSIDE FE0 which based on rules will route traffic to the desired VLAN .
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So how do I ensure/route all traffic. Do I set a route on each interface(Vlan 10 and VLan20)  to the WAN/outside interface ?