A checklist for the aeroplane is all that I had until first solo. Then bought myself a headset as a present for the achievement. With nav came the kneeboard, chart, stopwatch etc. I would suggest being one step a head of the flying on the equipment side. I think it sets a good base for learning if you turn up with everything you need for the lesson. Prior planning prevents...... But in good time.
I think the study books are useful from the beginning because as you can read from others, exams tend to creep up and potentially hinder progress. Have a chat with whichever instructor you fly with at the time, the books don't need to be bought in one foul swoop. Perhaps your instructor could recommend an order? Usually starting with (Trevor Thom) Book 1: Flying Training (the PPL studes bible), and Book 2: Air Law and Met... oh are they in the same book?
