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Yes. Just not as profoundly as extensions.

Definitely this. Pull-ups themselves are a great warm up in my opinion. However, shadow boxing sounds like an excellent warm up for your tendons and ligaments in the arm/forearm and shoulders.

Seated Front BB Press to start, or standing if you feel competent, Military Press, etc. You could also try some handstand push-ups, which are brutal but ****ing efficient if you do them right.

I...

First, what the hell is too much? Preference takes over when determining your training regimen.
Second, it seems like you're just starting, so it could be too much for you. Personally, I think rest...

10 days, gonna have to bump the AZ thread! Message me peeps, I'm always down with new workout partners!

This definitely! Get that progressive overload goin' on, and be patient. It'll come. The looks of your pic, you've got what it takes, that's for sure.

Yes, this. Lateral raises, front raises, shoulder press with both DB and BB, PULL UPS.

Yes, do it. Especially with the outcome you experienced when you tried it once. That tells me it pushes your limits. Course, to each their own!

Definitely go with this one. Google is your friend.
My advice to you is to try out some "intuitive lifting". Or in other words feel out your reps and sets, and see what you feel like could bring you...

All of the above kid. Good luck!