Pretty much, everybody gave you all of the advice you need...
You must crawl before you can walk...
Start right where you are and keep growing. Great choirs come from great leaders who take time to develop them as a whole and as individuals, great singers with a great committment to the Lord and to the choir, great committment to growing/streching as a singer and TIME. If you develop those things, musicians will FLOCK to play for you...
MrSparrow