I know there are a lot of meatloaf recipes out there but this one isn't out there, and I love it. All of the measurements are estimated. I have never actually measured everything but just put in roughly what looks good. I especially have estimated the bread, oats, and crackers. As far as those go, I would suggest putting in as much as is needed to keep the loaf from being soggy, but not so much that it is really dry. The beef can be lean or not- that is up to you. I hope you enjoy it! Its been my favorite!