Dear ###
If you truly have a calling into a fivefold ministry, you need to be under a church and there, to be submissive to whatever menial task is given to you- as Elisha served and washed Elijah's hands.
So hopefully, you are in some word-based Spirit-filled church first, serving and learning. And that is where God trains you-not in a sense of dramatic Hollywood kinda stunts but rather at the back side of the desert like Moses and John the Baptist were in. The desert training usually consists of a lot of character molding and tears. But don't be disheartened but rather love Him first with all of your heart and soul and strength even more than your prophetic calling. And that will be your defining moments, dear ###.
And if you are in a word-based Spirit-filled church, then you are able to catch on the move of the Spirit and hence be filled with the Spirit-simple. The pastors will help you understand better and here is a teaching and the move of the Holy Spirit before you can fulfill your calling:
http://www.pentecostalpioneers.org/personalityHS.html
Fasting is to humble one's soul before God..so get all the scriptures on 'humility' and study them. Having a call of a prophet can be tricky as one tends to think of himself that he is God's only gift to mankind...I have seen budding prophets who don't want to be under submission to their pastors and hence, they become a loose cannon and are terribly deceived...didn't Jesus warn us in the last days, deception will be rampant. And we are living in the last days, deception is rampant. So get all the scriptures on humility and study them and the Holy Spirit will reveal more to you in the coming days through reading of His word.
Philippians 3:7-10, amen.