Block inter-vlan traffic but allow access to the Internet

Hello,

I am using a Dell N2024P with multiple VLANs set-up and inter-vlan routing enabled. There are also a few switches down the line.

I am looking for a way to block all internal traffic from the devices in VLAN 9 but allow access only to the Internet.

I am only a Beginner which just completed CCNA 1 and 2 so be gentle :).

How can this be implemented? Let me know if you need more info.

Cheers!