Katie,
There's no need to urge us to hurry up with a reply. A teacher usually checks this Forum at least once a day and we always try to be prompt with our replies. Do remember, though, that this is a free service run by ordinary classroom teachers who have other work to do as well as this.
A good short summary on the Battle of Bosworth is this one:
http://www.schoolshi...sworthfield.htmor you could also try:
http://www.pomian.de...uk/bosworth.htmand
http://www.bgfl.org/...rth/context.htm .... the first couple of paragraphs will help you to understand why the battle was fought.
I hope this helps, but if you need more information then just use a search engine like Google and the search term "battle of Bosworth" (in quotes).