God tells us how to praise and worship him in His Word. John 4:23 says, "Yet a time is coming and has now come when the true worshipers will worship the Father in spirit and truth, for they are the kind of worshipers the Father seeks." In order to worship God in truth, we need to know that Jesus said "I am the way and the truth and the life. No one comes to the Father except through me." So, before you can worship in the way that God desires, you have to develop a relationship with Him through faith in Jesus, His Son.
The best way that we can praise and worship God is with our every thought and action. Romans 12:1-2 states, "Therefore, I urge you, brothers, in view of God's mercy, to offer your bodies as living sacrifices, holy and pleasing to God -- this is your spiritual act of worship. Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God's will is -- his good, pleasing and perfect will."