1) What can I read up on while I am NOT flying (saving up for lessons).
- PPRuNe
- Get a subscription to a GA flying magazine. Flyer for instance.
- Start on the PPL study books, for instance the Jeremy Pratt series:
AFE PPL Course Series Pack : AFE - Airplan Flight Equipment
2) Is this logbook OK?
Based on the description, probably not. But you'd have to look inside to make sure.
There are subtle differences between the way the FAA and JAR-FCL require you to record your hours. Getting the wrong logbook does not make properly recording hours outright impossible, but certainly does make it harder to get right.
You run less risk by buying any of the three logbooks from this page:
Logbooks - afeonline.com, Europe's favourite online Pilot Shop, by
3) What headset is good for student flying and taking up the right seat every now and again?
That's a really personal decision. Since you've got plenty time, you might want to wait for an opportunity to drop by a well-stocked pilot shop and simply try a few for their feel/fit. You might also want to keep an eye on eBay and the local classifieds at your local school/club for a good deal.
Anyway, at your stage it's probably not worth investing in an expensive ANR headset. Just get a passive one. You can always upgrade to an ANR headset later, and use the passive one for your passengers. Personally I'm very happy with this one:
SkyLite SL-900 Stereo Aviation Headset