So I've started keto off of what my friend said and have lost weight but don't really know what I'm doing. Please help.

I was told that at my weight when I started (300 pounds) I needed to eat meats and cheeses and avoid carbs. Now I've read a lot about keto and I seem I'm getting a ton of conflicting information. I've lost 30 pounds and I'm working out but I always feel physically drained. Could someone please explain how much and what exactly i should be eating? I've been limiting myself to pretty much 1200 calories of bacon and eggs a day and I don't feel all that good.