Rescued Two Puppies Off the Streets

Hi! My husband and I rescued two puppies off the streets. Mustang and Sally. I haven't had puppies in over 10 years, so I am a bit rusty with training and I'm sure there are newer and better techniques now.

1. They scarf down their food, I plan on getting slow feeders for them. Mustang will growl at Sally and push her out of the way and Sally will just go to Mustang's bowl. Obviously I know to separate them but since they are still puppies I'd like to correct this behavior.

2. They jump. So far we turn around and ignore them until they sit or lay down, then we will give them attention and praise.

3. Potty training. We have puppy pads, but in my past experience it's harder to potty train to go outside if they're taught to use a pad inside first. We have them for accidents just in case because they've never been indoors before. We take them outside with our older dog and they watch her, and use the bathroom.

4. Chewing. We have toys galore of all kinds, the heavy duty kind and soft stuffed kinds. So far if we notice them mouthing or going to chew on something they shouldn't, we redirect them and give them something they can chew on. We try to give them the option of a hard chew or a soft plush to satisfy them.

5. Walking on a leash. This has both my husband and I stumped. When we attach a leash to them, they just drop to the ground. They seem very uncomfortable and will not walk or move. I haven't had to deal with this myself so I'm not sure where to start here. Sally will flinch sometimes so I wonder if she has been mistreated before.

6. Littermate syndrome. My mom has two dogs that are siblings, the same mother but two different litters one after the other. They are both males and they have gotten into the worst fights that have resulted in expensive vet bills, my mom now has them separated. I want to prevent any sort of littermate syndrome. What are some things I need to do?

I'm sure I might be missing some things, but we've had them less than 24 hours and so far this is what I've come up with. They are the sweetest and smartest babies ever. Any tips, tricks, or advice is greatly appreciated.