Beginner boards need not be particularly high performance nor expensive. Longer, wider boards are good for training. But it should be bi-directional
(as this is the trend of the sport and most appropriate for tricks) and of standard conifguration.
As you become more proficient, you may desire a shorter, thinner board. There are many good boards on the market. Ask your nearest kitesurf/windsurf
shop. I prefer Cabrinha (check the links section).
Regarding kites... most manufacturers selling good surf kites also make a smaller, light-power training kite. These are often just smaller versions of
their standard design. It would be most beneficial to get one of these and learn not only how to fly safely, but how to control the de-power and quick
release systems. Buying a standard dual-line sport kite will not really help you learn to fly power kites for kitesurfing.