What is Acceptable in Worshipping God?

Much worship today is decidedly ME-centered. Many churches are as competitive and consumer-driven as most businesses. But God is not indifferent concerning how he is to be worshipped. Some things are acceptable and pleasing to him, and some things are not. How can we know? What is the regulative principle of worship and how is it related to Sola Scriptura? What worship activities can we be certain are pleasing to God?