Structure

The choice of heading you use (ie how many equals signs you put around your heading) is what does the headings. I don't know it there is a way to make the sections lettered instead of numbered. You have them tiered now, which is great! Although looking at the list, I'm sort of wondering about my suggestion to break things up into Federal and Provincial. Maybe you should try just bolding the name of the legislation instead of making them sub-sub-headings so that your provincial list isn't a mile long and see how that looks in your table of contents?

Re: Effects of Privacy on Archives, I think it depends on how much you have to say about the laws and the effect they have. Would a third sub-heading (2.3) under Privacy Legislation be appropriate, maybe? That way it's linked directly to Privacy, but you've got your solid idea grouped together and not broken up into snippets.