You don't "really" need to
smoke ribs to get them to come out right, but you do need 'smoke'.
What kind of equipment do you have? Everything you've described sounds like it's indoor cooking, which is still doable... but it makes it interesting.
There are endless ways to cook ribs... you just need to try them all until you find a way that you like best.
It's all about timing... which holds true for pretty much any barbecue. Unlike hamburgers and hotdogs, which are typically cooked on an open flame and charred quickly, barbecue (imho) is cooked one of 4 ways: slowly, REALLY slowly, stupid-crazy slowly, or 'spend your whole weekend, just for 1 freaking meal' slowly.
Ribs shouldn't take more than 2-3 hours. There just isn't enough meat on anything besides bison ribs (so I've heard) to justify spending an insane amount of time on. So, that puts 'most' ribs in my 'really slow' category. I don't know how you could maintain a low enough temperature to not destroy your meat over 24 hours, yet still be healthy enough to inhibit bacteria growth. 180° or so maybe? I'd still think that it would cook the fuck out of the meat in 12 hours. Anything less than 150° and you are BEGGING for DANGEROUS (life-threatening) food poisoning.
Also... Do you remember to remove the plasticy membrane from the backs of the ribs before you cook them? I didn't know to do that when I first started and they were always impossibly tough. To do that, turn a rack meat side down. Insert a sharp pointy object, such as the tip of a meat thermometer, under the membrane (the best place to start is right next to the first rib bone). Using a dish cloth or pliers to gain a secure grip, pull off the membrane.
Did you want a specific recipe to try out? I could list my favorites if you wanted.
Pretty much... if I assume you are using a charcoal grill and cooking baby-backs... just slow smoke them, over 250°-300° for about 1.5-2 hours. You'll know they are done when the meat has shrunk back about a quarter inch from the ends of the bones. They should also feel slightly fragile when you pull them off the grill, but remember that they'll continue to cook when you take them off. So... don't overdo it. Also, when you take them off and put them onto your cutting board, keep them covered in a tent of aluminum foil until you are ready to work with them. That'll help keep the moisture in. Nobody wants dried out rib meat.