I think of all the movie versions of Jane Austen books, Sense & Sensibility is the best. I would rent that. If you have trouble getting past the first few pages of her books, I would watch the movies first. That's what I have done. There is a really good BBC/A&E version of Pride & Prejudice that is very true to the book and it is about 5 hours long. It stars Colin Firth. I would check out those two DVD's and not worry about the books.
I haven't read Mansfield Park yet, but I have seen a movie version of it and a BBC version. Neither were as good as Sense and Pride, but i have heard that the book is so much better.
Sense & Sensibilty is story about 4 women, a mother and her 3 daughters, who are forced out of their large estate to live practically penniless after the father dies. Will the daughters ever be able to find suitable mates now that they no longer have money?
I believe Sense & Sensibility won Best Screenplay the at the Oscars.