Yes, please avoid "no" and especially "bad dog" as much as possible.
Instead of scolding bad behaviors, praise good behaviors.
Also, it sounds like some obedience classes could be very beneficial. Look for a beginner or intermediate class to do with your dog. You'll only be able to take one at a time, but it will really help. Look for a positive-reinforcement based training class.
The most useful thing we ever learned was in puppy or beginner class - the command "leave it". Oh, and "drop it" comes in handy too if you aren't quick enough to say "leave it".
Try to think of your dogs as infants.
If there is something you don't want them getting into (i.e. diapers), you need to make sure that those things are out of reach.
If they have done something wrong but you didn't catch them in the act, never scold them. They won't associate you being angry with the thing they did a half hour (or 2 minutes) ago. For example, you come home to find diapers (or kleenex, or garbage) strewn all over you house. The dogs have been getting into everything while you were gone! If you yell at them, they have no way of associating the yelling with the garbage-chewing.
A better example I think is running off. Dog runs off, you call it back (or chase) and once you have the dog back in the house (or on leash) you yell at the dog for running away. Dog associates the yelling with coming to you, not with running away (that was too long ago). Next time the dog might not come.
One other thing: exercise. Are the dogs getting enough exercise? Destructive/rambunctious behavior is a common sign of boredom. What breed(s) are they? What was the breed meant to do (work, herd, hunt...??). This will help you determine their exercise needs. Try a 20-30 minute walk daily (more or less depending on breed - some breeds I'd say 45min.). It can really help. Oops I now see they're Pomeranian. Well, then 15-20 minutes may be enough to see a noticeable difference.
I'm sorry you're having a rough time. It's a huge amount of work to have a baby and 2 dogs.
Please never never chain your dog outside. Risk of strangulation comes to mind first and foremost. This link has more information about the risks and harms of chaining a dog (CAUTION: GRAPHIC).
http://www.dogsdeservebetter.com/articles.html