Nothing is unknown to God. This means that you can ask that he fills you with the wisdom and knowledge that you need for life.
Thank you, Lord, for bringing me to this stage of my life. I have come to you about a crucial matter. I need your help to make this decision about (decision to be made). Father, I don't know exactly what to do and I am scared of doing the wrong thing.
Grant me wisdom such that I can discern right and wrong. Help me to choose wisely. Give me a sound mind and protect me from rash judgments. Open my eyes to see what ought to be seen. Take away every confusion in my heart. Let my decision be what pleases you. Amen.