I thought there would be some Bundy sailors on this forum but no one's replying.
The most poppular spot in the Bundaberg area is Eliott Heads, just south of Bargara. This spot works best in south easterlies. It consists of a river estuary with ultra flat water next to a sandbar. As you follow the sandbar along you head out through the river mouth into small surf in a side-onshore direction. The waves there are very forgiving, rarely more than head high. A lot of fun for jumping but too onshore and mushy for down the line wave riding. Watch out for stone fish and sting rays though.

Small lumpy waves can also be found at Bargara, Mon Repos and Moore Park beaches. More serious down the line wave sailing can sometimes be found further north at Wreck Rock on the way to Agnes Water.
I have never sailed in the area on a northerly.
Hope this helps.