The basis of any relationship is trust, and trust is based on truth. This is also true of a relationship with God. God has revealed all the truth we need to know about Him and about us. If we will take the time to understand what He has revealed, we will then be ready to decide if we are willing to trust Him with our lives.
There are four basic truths that we need to know in order to have a relationship with God. Read the first truth here.