Concerning #2
rootsh doesn't need a password ...

(I wouldn't ...nor device password...there are a good long list of threads and posts titled like :
"forgot password , locked out of device , help!?!?"
next thing you know you forget it....then you are up a fast flowing body of water without a handheld device to navigate with)

concerning all your other many questions ...
essentially what you want is someone to do the leg work for you and hunt down answers and forum links to answers...
And it may take a lot of time to do just that..
Some here may know one or two... or a couple of quick answers...
But...
Why not use the the search button to your right?
That is how people figure things out here.

Asking for answers for the list of questions you have ...
before looking and trying the answers provided in forum posts by those who have posted the most recent successes ..
is working backwards.

I would suggest looking first.
That is the whole point of keeping a decade plus of past threads and posts...
to research them.
If you have a hard time after hunting down your questions...
and after finding answers ...
whether due to the solutions being outdated ...
or no answers at all found...
Then definitely ask for help.

But with your particular questions...
I think you won't find it too difficult to hunt down the requisite posts concerning the topics...
They quite common questions ...
So there should be plenty of documentation readily available ..
via the search function here.