You can either make up your own logbook, or use the proforma logs provided by the MLTB here
I use a slight variation on the MLTB one that I made myself, and keep the log on my computer, then printed it out and popped it into the MLTB folder when I went on my ML course. They liked the word-processed presentation, partly I suspect because it was legible!
I really enjoyed my course, it's made me more confident in my abilities as a mountain walker, as well as highlighting some areas I could do with improving on. When I did the course I had no intention of taking it through to assessment, I did it solely for personal development, though the way things are going I may end up doing the assessment too!
Like Kate I do my own thing - based on the MLTE version but with some imbedded photos and the like. I just convert it to a pdf and give it to whoever wants it on a memory stick.
For the log, you are probably best basing it on the ML 'standard' - when I did it you got a few pages in your book on registration (but that was a few years ago).
Anyway, good luck with i, it should be enjoyable and you will almost certainly learn stuff (perhaps about yourself rather than mountaineering, who knows).
And I would definitely recommend going on to do the assessment, as well. Loved that - hard work, but good.
yep, as above, when you register with the MLTA you receive a log book, so then you can fill in all your 'previous 'QMDs (quality mountain days). Only 20 needed before training, and these can be retrospective. Having done both the training and the assessment, I'd heartily recommend them. As has been said, the increase in personal confidence and improvement is worth it in itself, but the assessment for me was always the plan, and was tough, mostly in the mind for me, but what a thrill to pass! Best of luck.
I thought they wanted you to demonstrate some variety...? 
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