Yes, as per the above comment, be aware that buying your own aircraft to do a PPL in is a lot more expensive than hiring an aircraft through a club, and unless you are intending to fly it very regularly (say a hundred hours a year or more) is really not an economical investment. I would also be very careful buying an aeroplane on Trademe; there are often a lot of hidden costs which aren't apparent to someone new to the industry - too many things to list here but, for example, an unusually cheap aeroplane may be in need of an engine overhaul which in some cases could cost more than double or even triple what you paid for the aeroplane.