Carnival Skittles advert

I have now re shot and edited all of the Carnival clips, I have also imported the soundtrack for the advert. I now need to search for relevant sound effects of the crowd and the engines of the floats. I also need to record voice overs, for the end clip, we feel the lack of voice overs helps for the soundtrack to match the action; but also to make it less compact as sound effects, voice overs and the soundtrack at the same time would make it hard for our young demographic to concentrate and take in the advert.