I can foresee no possible way for Orochimaru to regain use of his arms. Even if he gets new ones from someone else transplanted, he still will not be able to use them.

The only way I can see to get them back is to use the Death God jutsu that Sarutobi used on him. But then if he did that he'd die, so it defeats the purpose.

And obviously, confronting Tsunade like he wants to kill her is not the way to go about getting her help for anything. I honestly have no idea what he's planning by finding her, other than maybe eliminating a candidate for Hokage, though I dunno if he knows Jiraiya is out and about with Naruto also.