routing table

Hello,

I have a virtual network with 192.168.0.0/24. In the virtual network is a firewall with 192.168.0.5.

Now I want to route any outgoing traffic on the virtual network through the firewall.
If I create a rule 0.0.0.0/0 to 192.168.0.5 - The internal devices can not reach each other. What is the best way to set the routing rules here?