Pour as much milk as you want for your gravy. How much depends on what pan size. set the milk on medium high heat.
Open the can of biscuits and follow instructions. Cut up your bacon and throw it in a skillet with the sausage. once your milk is starting to boil, sprinkle some flour over the milk. MAKE SURE THERE AREN'T CLUMPS. stir occasionally. Keep sprinkling flour every now and then until it's as thick as you like. keep a close eye on your gravy and make sure you stir.
When the meat is done cooking, drain the meat and put in the gravy. The gravy may take a while to thicken really well. but when it's close to being done dash some salt, pepper, and sage. when your gravy is done pour some over your biscuits and Enjoy! :D