How do I say... "Could you please do me a favor" in Japanese? Please answer phonetically and well in the right writting manner.. Thank you!

From where should i begin to study Japanese? A. Kanji B. Katakana C. Hiragan; Help me out please! Just write the answer by the letter and make a comment if u have one :) I'm a Spanish native speaker so if any one from japan want to learn some few stuffs about it, just PM me!

This is me Hello everyone My name is johan rey, im a student of international bussines administration, im spanish native speaker and im learning english i think that my english level is closer to advanced and that way i'd like to speak it more often to work out my accent and i'd like to teach others spanish if they need to.... ok thats it i just hope that u enjoy talking to me if we got the opportunity... Cheers and take care y'all ;)