The way I usually do it is to brown some onion in oil until it starts to get transparent. Then add a few cloves of minced garlic until it's fragrant. Then add 3/4 pound of ground beef and a 3/4 pound of italian sausage. Then I drain the fat, add a large can of tomato sauce, a large can of chunk tomatoes and a couple small cans of tomato paste. That's your sauce.
For the cheese layer, in a large bowl, combine a large 2 lb container of 4% cottage cheese and 4 cups of shredded mozzarella. If you so desire, add a package of frozen spinach to the cheese mixture.
You're then going to layer everything in the Crock Pot, starting with the sauce layer. It usually makes about 4 layers of each of the sauce and cheese. So a layer of sauce, a layer of uncooked lasagna noodles (you don't have to use no-boil, regular works just fine) then a layer of cheese. Repeat until you finish off the ingredients. I would try to make the sauce layer the top layer, then top it with some grated parmesan and cook it on low for 4-5 hours.