Hi VFRT,
All of the previous have given good advice, just a few more.
The main thing is to follow the KISS rule. Do what is easiest for you.
Donīt forget that you are not required to carry your log book with you all the time, only "produce it in a reasonable amount of time", 7-10 days if I remember correctly. So if you find it easier to jot down hours on a PDA or a diary, when away from base, and fill the log book out when you get home, go for the larger style.
As you are just beginning I would sugest that at the end of each part of the course eg SEP then MEP, make a summary of the hours, types etc. This can be done in red ink. The advantage is that when you have to fill out those CAA forms, job applications etc you donīt have to repeatedly add up all the hours, only the summaries. This could be done throughout your life, if you end up being a gypsy in aviation.
Then it depends on what you are flying, at one time I had one log book for FW and one for RW. As MH152 has said, you can use a very simple log book if you are only flying one type. But consult the EASA rules to make sure you are recording what is required. (Havenīt got the ref with me)
Pooleys Prof. log book is ok but its difficult to add up hours if you end up flying SEP, MEP and multi crew a/c. Plus the totals section is not very big, which would not affect you yet but hopefully it will
.
Good luck with the course.
WH