If you've never flown a power kite, get a 2 or 3-line trainer kite and learn how to fly that first. I'd recommend a 3-line trainer because self
launching/landing and relaunching is much easier than a 2-line. Practice as much as you can with the trainer kite. Learn how to do powerstrokes,
figure8 it in the powerzone, walk crosswind with the kite parked, downloop it at the edge of the window, prevent it from backstalling/frontstalling,
and launch/land at the edge of the window (you'll do this with the big kites). Practice as much as you can until you can fly without looking and
feel/predict what the kite is going to do before it does it.
Then go take an intro/beginner lesson to kiteboarding on water. They will cover the trainer kite (tell them you already know how to fly a trainer
kite, they might test you, so be preapred), big-kite anatomy, how to rig it, safety systems and procedures, body dragging, and if there's enough
time/you're lucky they'll show you how to board start.
If you take an intermediate lesson, they will teach you how to boardstart if you hadn't learned already, ride crosswind, how transition, and ride
upwind.
Taking lessons doesn't necessarily mean you are going to know how to kite at the end of the ~6 hours the lessons last, you are going to have to
practice quite a bit to fully develop your stance, and get a good handle on hat to do with the kite to get you upwind, and how to transition without
sinking.
Doing the trainer kite portion on your own before taking the lesson will open up all the time they would have spent showing you how to fly a trainer
for flying a big kite. Plus you will be more confident in steering the big kite and will probably be more comfy with amount of power a big kite will
produce. The only thing you'll have to learn is what sheeting in/out does (pulling the bar towards/pushing it away form you).
As far as the c-kites you purchased, technically you can learn on them, but older c-kites are less stable and have a much more narrow windrange than
bow kites/SLE kites. You will have a MUCH easier time learning on bows/SLEs because they are more stable, have more windrange, and relaunch much
more easily due to the shape of their leading edges and wingtips.
Kites:
2012 TS 7,9,12/2007 Waroo 3,5/2009 Kahoona 9.5
Flexifoil Ion 2 8.5
HQ Hydra 350
Naish Helix 2, Cult 3,4.5
Ozone Zephyr 17m
Rides:
2011 Best Profanity 134, Cabrinha Kiteskate, Cabrinha Nugget, 2k9 Cabrinha Plasma 146x50, 2k9 Flexifoil Delta 139x41.5, 2011 Slingshot Darko 135x41,
Slingshot Scud, Tona wakeskate, Flexifoil Flexdeck, MBS Pro 90, MBS Ambush x 2, some oldskool buggy