God wants us to do listen to his voice, or that is obey him. He wants us to learn about him and his qualities. He wants us to try to reflect his qualities as best we can.
Lastly he wants us to recognize his position and power. We are also his witness that Satan the devil is a liar. These are the only "things" that we can give back to god. What material things can we give god that he doesn't already have or can create? Acts 7:48-50
"However, the Most High does not dwell in houses made with hands, just as the prophet says: 49 ‘The heaven is my throne and the earth is my footstool. What sort of house will you build for me? Jehovah says. Or where is my resting-place? 50 My hand made all these things, did it not?"
God has us give him our material things, but this is not because God needs them. Rather he is looking to see by our actions how much we love him.