To praise is to say good things about. To praise God is to say good things about God. This certainly should not be difficult for those who love God. God is the creator of the world, our provider, our savior, and in whom we have hope.
To worship is to show dedication. To worship God is to show dedication to God. This contains, but is not exclusive to, the worship service at Church. There we should show our dedication to God. But let it not end when an hour has elapsed or when we’ve walked out of the door of the church. Dedication to God should be shown in all we do. We show our dedication to him when we follow his commandments, when we live in love of Him and of our neighbor, when we pray, when we work, when we eat, and when we sleep. All things are to be done to the glory of God.