Well from my experience, and this has been with many predominantly caucasian churches.
They like the style of our music, however they become intimidated because they cannot play our style of music. Many do not want to put the practice time in to better thereselves. Your work is cut out for you, but if God called you to it, it shall be done.
There's nothing more frustrating to a worship leader/musician than having to limit your ability because the ability of those around you is lower. I would pray and seek God, talk to the pastor, meet with the band and let them know your expectations prior to making the committment. The other thing is you have to teach them that the music is a ministry, and they're not just there to play an instrument, they are there to minister to God's people. If you play guitar, minister to people on that guitar, if you play drums, minister to people while playing the drums. The whole purpose of the worship band and singers is to prepare the people for God's word, laying a foundation, purging the atmosphere through worship so that God's word can go forth with authority. Every musician and singer has that responsibility. Next everyone must be on one accord no division. Make it plain your expectations of the band and singers, even the style of music/worship that you are trying to achieve for the church (after speaking with the pastor).
after you have laid this foundation you will find that some people will be for you and others may not be in agreement with the vision that you have laid out for the worship team. some may stay some may sit down, but this is all cool, because it creates a unity and those that cannot submit to the authority given to you probably should sit down.
Finally give them the tools that they need to accomplish this transition. Get them CD's of the music that you would like to teach, give them ample time to digest the music. If they need sheet music get it for them. then come together and go over the songs until they are satisfactory and then introduce the music on sundays. I hope i was helpful. feel free to email me i've been in that postition many times