OK, first off, it's only been five days! You just had major abdominal surgery! When I got my colostomy, I was in the hospital for a full week, and I remember the pain being intense, and sleeping practically impossible. If you aren't still on pain meds, get some. Sleeping on your stomach doesn't have to be out either. There is a thing called a pregnancy pillow that people use for visiting chiropractors, physiotherapists, etc., for treatments that require them to lie on their stomachs. I know you can order them online, so do some research. It's basically just a pillow with a big hole in the middle.
Getting used to the various products and finding the right system for you will take time, period. You do need to be patient on this one, and it will be trial and error, but you will find what works, and it will be worth it. You might actually be lucky and find a combination that works well quickly...or not. Try different brands of pouches, and one-piece versus two-piece, as not everyone likes the same system. You may not need a barrier ring with a colostomy, but trying them out is a good idea, as they could increase your wear time.
The smell is almost certainly in your mind because if there was an actual smell, it would mean you were leaking, and you would know about it right away. I tuck the end of my pouch into the waistband of my panties, so there is no feeling of something hanging between my legs. You could also try using an ostomy belt for extra security. It's a personal thing. Some wear them, and some don't. I've never heard of anyone complaining about NOT having mucus coming from their bum! Don't worry, it will come, but it may be intermittent and infrequent; mine is.
You haven't mentioned leaking, which is usually the first thing people complain about, so I'm thinking you are probably doing a lot better than you are giving yourself credit for. Hang in there. It's VERY early days.
Terry
p.s. As for cooking and cleaning, give it a rest. You shouldn't be doing anything very physical at all at this stage, no heavy lifting, pulling, etc. You are at high risk for hernia. Walking is the best exercise right now.