What are some examples of easy to learn yet effective music production apps for the iPad?

I’m a beginner in the field of study that is “music”. About to embark on a voyage across country to reinvigorate my inspiration once again. And I am ready to step my game up, and actually begin recording and producing the instrumentals behind my poetry. And as luck would have it, I have been gifted a 32gig iPad!

Any suggestions for essential apps that I can teach myself with, would be so greatly appreciated!

:) aloha and mahalo!