There are several types of fasting. The one you choose is between you and God. He will honor your best sacrifice.  

Full Fast: Drink only liquids (you establish the number of days). 

The Daniel Fast: Eat no meat, no sweets and no bread. Drink water and juice. Eat fruits and vegetables. Learn More 

3-Day Fast: This fast can be a Full Fast, Daniel Fast or give up at least one item of food. 

Partial Fast: A partial fast is from 6:00 am to 3:00 pm or from sun up to sundown. You can select from three types of fasting —a Full Fast, Daniel Fast or give up at least one item of food. 

Scripture References for Fasting: Matthew 6:16-18, Matthew 9:14-15, Luke 18:9-14 

Relation to Prayer and Reading of the Word: 1 Samuel 1:6-8, 17-18, Nehemiah 1:4, Daniel 9:3, 20, Joel 2:12, Luke 2:37, Acts 10:30,Acts 13:2 

Corporate Fasting: 1 Samuel 7:5-6, Ezra 8:21-23, Nehemiah 9:1-3, Joel 2:15-16, Jonah 3:5-10, Acts 27:33-37

Remember that it is the attitude of a heart sincerely seeking Him to which God responds with a blessing (Isaiah 58, Jeremiah 14:12, 1 Corinthians 8:8). May God greatly bless you as you fast!