I found, whist trying to sort out this problem a website which seemed to be the answer to my prayer. I was convinced when I read the paragraph:-
If you're concerned about whether or not you need to learn styles, we can put it rather simply: you do. Styles are the architecture upon which Word is based. Just about everything in Word is style-driven. In fact, many people in the industry refer to Word as a "style-driven" program.The site which has the strange name addbalance.com seems to have originally been compiled for the use of the legal profession, who I suspect more than most need faultless document. This post is to signpost the source, I shall be making further posts when I have researched the style issue a little further and will return with my experiences.
To get started follow this link.
Interestingly there was a link on this site to another site which I had bumped into on a previous search but had lost the link (hence this post to make sure I don't lose these links again). The site is called Shauna Kelly - Making the most of Word in your business. I have to say a much more professional looking site than the other one. There is a particularly good beginners section on styles here. The site covers all aspects of Word and rather than try to explain the layout and approach of the site I would suggest you have a look yourself starting with the Basic Concepts. If there is a problem with this site it would seem that many of the basic guidelines refer to versions of word prior to 2010.
You can go straight to the style section by following this link.
This is also an excellent website that I have referred to on previous occasions The Word MVP Site this is the link.