You were still adapting to your new mutant form. After a long discussion, Master Splinter decides to welcome you to the Hamato Clan. You'll go under training by Donatello, with a little assistance by Leo on the side.

"Hey, um..." The purple-mask turtle waves quite nervously at you; it's his first time ever training someone. "Ready for your first lesson?"

He hands you an extra bō staff of his, your starting weapon. You smiled at him, nodding that you're indeed, ready to learn.