From my website:

1 Brighton ( 30mins north of CBD )

Wind directions : SSE to NNE
Conditions: Shallow water with small chop and small waves. Quite a walk out at low tide. Bad in very high tide.
Precautions: Blue Jelly fish in Summer, lots of Stingrays and the odd stick or shell underfoot.
Small beach area - be considerate of all other beach users !!.
Rock walls either end of the beach - be aware of these at all times.
Small Reef approx 400 m to the North and hidden at mid to high tide.
General : Located between 18 and 19th Avenues on Flinders Parade in Brighton.
Hands down the safest place for learners allthough it is getting crowded these days.
Large area to kite , but people tend to congregate in front of the beach area - crazy!. Kite down south about
300-400 metres and you'll have your own patch to kite in!
Public amenities 700m walk north.

2 Wellington Point ( 30mins east of CBD )

Wind directions: SW/N/E all tides. SE in high tides.
Conditions: Flat to chop with some butter flat water at mid tide next to the sand bar.
Precautions: No Equipment or rigging allowed on the grass areas. All setting up and kiting to be below the high tide mark due to local council rules. Fines have been issued! A lot of people at times on weekends and holidays.
Rocky areas to avoid - check with the locals for advice on site specific areas.
General: Located at the end of Wellington point road. A very nice spot in summer E and NE winds.
Some of Australia's top kiters kite here regularly - check them out!
All public amenities including showers and shop.

Other places in Brief

2 Wynnum / Manly - Advanced kiting only, many hazards including rocks and small launching areas - check with locals.
2 Thompson's Beach - Int/Adv. S-SSE located at Victoria Point.
3 Scarborough - Int/Adv. beach taking W through to NNE. Rocks and busy with public.
3 Queen's Beach - Int/Adv. beach taking N to SE. Deep water generally and frequented by swimmers.
3 Sutton's Beach - Pretty much same as Queen's except NE to SSE.
3 Woody Point - Advanced only. All rocks and gusty wind. SW-W
3 Pelican Park - Int/Adv. SW-SE. Some rocks, but a nice graded beach to launch and land.
4 Bribie Island - Deep channels and strong tidal flows - not for the faint hearted or inexperienced!

if you are a beginner go to Sandgate or Brighton. Redcliffe are not the best beginner beaches...less margin for error at Redcliffe Beaches.