Set up assistance - interfaces, VLAN and L2 switch

[DFIWindsor]

We recently replaced a failed L3 switch with a L2 switch. Now my interface settings etc won't allow my VLAN to connect through to the internet. I need to setup my Fortigate 80c so that it handles the routing as the L2 switch can't. Can anyone point me to a router on a stick setup for the interfaces?

We need to set up 3 VLANS in total. I am getting confused by the default VLAN1 on the cisco switch. Can I leave this as my management VLAN and set up 2 more that I need?

Here is a link to the current settings (http://imgur.com/a/51byJ)

The router is connected to port 12 on the switch. Port 1 and 2 are the VLan that I need to get to the internet with. I have port 5,6 and 13 connected and I am able to access the internet on these ports.

Please advise.

Thanks