How do I get my 6-month-old puppy to stop showing undesirable behaviors?

Normally, he is a very quiet, cuddly, lap-pup. However, when he’s awake and not receiving constant attention, he is a handful!

When there’s noise at the front door or outside, he barks incessantly. (His non-stop barking hurts my ears!) When he is given alone time, he whines obnoxiously. (I’ve never heard such whining in my life, and I’ve been around all types of kids!) When he has floor time and is not allowed on the couch, if he doesn’t get non-stop attention or if he is reprimanded for doing something he’s not supposed to do, he pee’s on the floor even if he just came back from a potty break.

He has at least 8–10 toys, yet he prefers to chew on pillows, socks, and blankets. All of his toys are hard because he has destroyed every soft toy he’s owned.

During walks, he pulls his leash constanstly and attempts to put in his mouth anything he’s not supposed to eat. Also, he barks and growls at EVERYTHING.

The only command he obeys is “sit.” We’ve tried dog training school at around 4 months, but after 3–4 sessions, we dropped out because pup was easily distracted. I know dog training will help all of us (pup and two mommies), so I’m in the process of researching other schools/trainers (we didn’t like the last place, it wasn’t a good fit for us).

I love my pup beyond words, but his undesirable behaviors are driving me crazy and I’m starting to turn into “Mommy Dearest meets Cruella de Vil.” HELP?!?!