This is what I do
1) start
Anydvd
2) rip the movie to my HD with dvd decrypter
3) start Rebuilder and choose what Encoder I want to use. I have selected output to iso image file.
4) burn with imgburn
When you purchase CCE install it then in rebuilder settings you have to select the path where you have installed CCE.
Here is a guide for you it is a bit outdated but should still be of great use to you.
PRESS ME
EDIT: You do not need to buy CCE or Procoder 2, like I said HC18 which comes with rebuilder is a great encoder to start of with.