Hi Simon10,
Buying second hand kite gear as a complete beginner is exactly like buying a cheap second hand car without any mechanic knowledge... there is a fairly high chance you will get screwed.
I used to have the exact same way of thinking as you when I was learning 16 years ago. Just buy cheap stuff and go from there. Turns out the first 3 kites I bought second hand were all pretty much junk. This not only slowed my progression down, made it more dangerous, but was also a complete waste of money. The third kite I bought second hand was only last year's model so I thought I was getting a good deal. The very first time I crashed it the water, it broke in half and was too expensive and too worn out to be fixable. Turns out the kite was used and abused in a single year, but of course, I had no idea how to inspect a kite back then.
I guess second hand would be better as it will probably hit the ground quite often while learning.... it's actually the complete opposite. You should invest in a kite that is in great condition so that it doesn't break when you crash it, and believe me, you will...a lot!
There are other things to worry about such as the safety system, if it's beginner friendly gear or not, is it holding air, are the lines well tuned, is it the correct size etc. We go over these things in two articles from our blog:
www.kitebud.com.au/6-things-to-look-at-when-buying-a-used-kite/www.kitebud.com.au/how-to-choose-a-kite-size/if you're on a budget, the only piece of equipment that isn't as important when learning is the board. If you can find the correct size second hand board that isn't 20 years old, then it should be just fine for learning.
A Good quality kite and bar will last you a while, will make learning easier, faster, safer and allow to progress with confidence.
Unless you buy second hand gear from a reputable shop, I recommend you avoid buying second hand gear if you don't have a very experienced kiter to shop second hand gear with you and inspect the gear in person with you, especially the kite and bar.
I hope this helps!
Christian - KiteBud