God has a perfect will for your life but how do you know what that will is?

Romans 12:2 (King James Version)

²And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
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Ponder this:
If we want to know the will of God we must be constantly renewing our mind. Your mind is renewed as you spend time with God and you meditate on His scripture, listen to His voice, Prayer and any other form of communication you have with God. God will renew and transform you through these avenues and the perfect will of God will be made clear to you.