Hi caviar
Ticking the 'it varies' box should not affect the points. However, you must explain in detail how it varies hourly/daily and if you can do so Reliably, Safely and Repeatedly and if not, why not.
There is much more detail you should include when ticking the 'it varies box' and the ESA claim guide has a section explaining it in detail.
As for the missing pages, I suspect you may not be accessing the full 'members only guides' found here:
www.benefitsandwork.co.uk/help-for-claimants Please come back if you need any further help.
Lisa