Find a plan that will take you through the Bible every year. I fear it is prayer. Prayer should be the beginning and end of a missionary's work. A decision to commit yourself to being a missionary should be steeped in prayer. Prayer is the key tool in support-raising.
Prayer is what gives success to a mission endeavor.
Read Scripture, especially Psalms and Proverbs. Praise, specifically about the things you gleaned from the Scripture. Confess things of which the Scripture has convicted you and for sin in your own personal life in. Thanksgiving for what the Scripture has shown you and for other blessings. Petition the Lord for needs and cares of your life and ministry.