I praise God for you Mrs. Charlotte! Doing the will of the Lord always removes us from our comfort zones. It encourages us to just trust God. I believe God has already equipped you for the task at hand. You are on the right track with viewing DVD's and videos about dance. Please be careful because there are some items that are not founded on the Word of God. I have had the opportunity to utilize some good sources about the Ministry of Dance...Aimee Kovac's book "Dancing into the Anointing" is a good book to begin with. It gives a basic foundation on the Tabernacles, Flowing with the Pastor, musicians etc. Additionally, it speaks about prophetic dance and much much more. Of course this is just once source, there are many others. As far as movements, the american sign language site (religious signing) maybe a beginning point. The movements will be smaller, but you can adjust them accordingly. I believe the best source is to let the Lord lead you....I believe He will indeed show you His heart through worship. So, I encourage you to listen to your music....the lyrics...the beats....high points and the soft points....He will indeed give you vision.
God Bless You and be encouraged
"Dancing Preacher"
(By the way I have been ministering in dance for about 10 years....God is good...and you are right....He will never forsake the righteous...!!!!)