Hey mate, I had some pretty good success on bull sharks in the broadwater earlier in the season, my best was 183cm. I'm landbased as well. It might be too cold for them now, but I'm probably going to put an overnight trip somewhere in the broadwater in the next few weeks to see what turns up.
I'm certainly no expert, but I'd say anywhere that has a decent drop off or channel should hold them. I fish all night when I go, and have found the most action to be around the high tide, although may be different in different areas of the broadwater. I use 30-40cm mullet or a piece of eel roughly the same size as bait. The most important piece of advice I can give you is to use decent trace material, I f'd around with the cheap Halco traces and a lost a few sharks because of it.
Cheers,
Kaidon