At the church where I am MOM, we normally start actually with slow worshipful songs and then gradually increase our beat each song until we we reach our portion main praise song. Please understand that if God begins to move we let him move. I had a Bishop once tell me that 'music is a wave that allows the preacher to surf'. Our service order normally consist of this... Worship,Praise,Offering,Praise,Worship,Sermon,Worship. I don't believe that doing it either way is right or wrong it depends on God your Pastor and your MOM.