Create Route


I am new to FreePBX and at the moment I try to create a route.
What I need is the follwing:
The User should dial a 0 to dial outside.
Then every number should go trough SIP/999 to external. SIP/999 is a octoBRi Card behind a Software which simulates SIP.
Is this possible? And if yes, what would be the steps to create this rule?

Thanks for your help,