G'Day Stubbings welcome aboard.
First thing, it's not a bad idea to have a quick look at previous posts, for example this one.
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=21849is a current thread on waterstarting with lots of good advice.
There's also been lots of advice on gybing, a search on that should bring up a few old threads.
Basically if you're planning in the straps, head slightly downwind, take the back foot out, place behind the opposite front foot strap clost to the rail, push your hip into the center of the turn, the board should then carve a nice arc, the harder you push the sharper it turns. What you do with the sail depends on wind strength, if nicely powered up, flip as you go thru the wind, (move old back hand to very front of boom just behind the clamp, let go with old front hand, pull sail across your body, grap opposite front boom with new front hand let go with old front hand and grab back of boom on new side.
If underpowered you can delay the flip to keep a bit of power on thru the gybe.
If overpowered oversheet as you enter to stop the sail overpowering you and dragging you off downwind, and flip just a tad early, cause if you flip late, the sail will go round so hard it's likely to put you off balance.