CHURCH MUSIC HELP!!

I need to submit my music for the ceremony. Big problem is not being familiar with the songs. I've been able to download some mp3 versions of some songs, but can't find many. The church gave me a list to choose from for each part (prelude, processional, gospel acclamation, and recessional) First question...what did any of you pick for each. Second...is the processional when the bridesmaids walk down and then it switches to the 'here comes the bride' or is this the song i walk down to?