You have basically two choices for PPL material. One is Trevor Thom, which is wordy and very complete. Jeremy Pratt has more diagrams and is in a less "dense" style. It's personal preference which you prefer - I preferred the Thom for example.
The OAA CBT are quite good, but expensive. And find a copy of the PPL Confuser - it is very useful for the exams for example questions.
As an aside, you need Air Law to solo (not a legal, but usually a club requirment) but it's just a memory job, Human Performance is very straight forward, and Nav is far easier once you've started cross countries with your instructor.
It can be information overload in the early stages, but the PPL itself is a licence to learn, and you'll likely learn more post PPL than you will in the course itself (especially in a practical "I want to go here" sense), just one of those things!
