I can actually answer these!
Yes, you make a second account for your alt.
Yes! hurry hurry hurry and get the bonus!
I think so?
There can be if you like, but I'm pretty sure you get the branch seal!
No, standard gentle fist can not be used like that, but you are still free to use normal taijutsu as well as gentle fist. Nothing is stopping you from using whatever techniques you would like.
Yeah! Or even gentle hands and hard feet!
You decide. You can be branch or main family, which ever you would like.