Start a savings account specifically for the purpose of giving. Then raise money to put in the savings account every month. Make a goal of how much money you want to save for the year. When Christmas rolls around next year, pray and decide how you will give all of the money away. Then start saving for next year.
1 Peter 4:10 "God has given gifts to each of you...Manage them well so that God's generosity can flow through you."