What are some tricks/tips for potty-training a puppy?

I have a 8-week old puppy, and she keeps pooping in the house. I don’t want to have to get rid of her, but it’s getting really old. We’ve had her for 2 weeks, and I am totally sick of picking up crap!
She is a mix. The mom is a pit bull/lab mix, the dad is a bulldog.

when and how do u start potty training a puppy?

I have a 5 weeks old male puppy, when should I start potty training him?, I read somewhere to take him out every hour to pee, how about to poo, how many minutes after eating should I take him out? and how bout if he’s already outside, playing by himself, do i just leave him outside to do his business?
his mom died rightaway after giving birth and he is the only survivor and i have no choice except taking care of him without his mom

How early on should you start training (obedience training) a puppy?

I have a 1 yr. old female labrador who it was suggested that I wait before training her so we could "bond" better. (Bad idea). Stellar isn’t a terrible dog by any means, she just has awful ‘manners’ with other dogs and people. (as well as not knowing some basic commands)
Anyway, I was thinking of getting another dog (a Dogo puppy) and thought it might be better to wait until I get the new dog and then start taking them to obedience training together(I could take the Dogo and my mom could take the lab), but I wasn’t sure what the absolute earliest is that you can start taking them to obedience school.

So, my 2 questions are, how early can you take a dog to obedience school, and do you think it’s a good idea to take 2 dogs to be trained?

Thanks