Getting your first steps needs a good kitehandling, no matter which sports you did, you need to think about your and others safety, this Means take a course and learn to fly kites.
Secondly, stepping into a ''gear''sport is always costing you some bucks, in the beginning, you do not know a lot about Good or bad second hand equipment, so leave that away if you have the means to buy new.
I myself can advice you the following brand, perfect quality good support and a perfect kite to start with but also to grow with, it is a very good alround kite that will upgrade your skills in no time, waves , freestile, freeride...it does it all, the same company can deliver you a well priced wetsuit, boards etc..this all with affordable prices compared to the topbrands, but with the same quality or even better, with great support, which sometimes lacks with the topbrands...
Just check out www.switchkites.com
And go for the kite called Element!