The first principle of sound decision-making is to get the facts. It's in the Bible, Proverbs 18:13, TLB. "What a shame—yes, how stupid!—to decide before knowing the facts!"
The second principle of decision-making is to be open to new ideas. It's in the Bible, Proverbs 18:15, TLB. "The intelligent man is always open to new ideas. In fact, he looks for them."
The third principle of making good decisions is to hear both sides of the story. It's in the Bible, Proverbs 18:17, TLB. "Any story sounds true until someone tells the other side and sets the record straight."
Hard time deciding? God will help. It's in the Bible, James 1:5, TLB. "If you want to know what God wants you to do, ask Him, and He will gladly tell you, for He is always ready to give a bountiful supply of wisdom to all who ask Him; He will not resent it. But when you ask Him, be sure that you really expect Him to tell you, for a doubtful mind will be as unsettled as a wave of the sea that is driven and tossed by the wind; and every decision you then make will be uncertain, as you turn first this way, and then that. If you don't ask with faith, don't expect the Lord to give you any solid answer."
Trust in God rather than self for guidance. It's in the Bible, Proverbs 3:4-6, TLB. "If you want favor with both God and man, and a reputation for good judgment and common sense, then trust the Lord completely; don't ever trust yourself. In everything you do, put God first, and He will direct you and crown your efforts with success."
Prayer helps decision-making. Jesus used this method before choosing the disciples. It's in the Bible, Luke 6:12, NIV. "One of those days Jesus went out into the hills to pray, and spent the night praying to God."
Humility is important when asking God for help with decisions. It's in the Bible, Psalms 25:9, NIV "He guides the humble in what is right and teaches them His way."