need help with music

So I am new to this and don't have time to search and see if this topic has been posted before. Sooo, Iwill get to the point. I teach Aerobics and I want to be able to play my music through my BB instead of investing in another Ipod. I have an Ipod shuffle I use but I can't see what song I am playing. Anyways, I used my BB this morning, but I was wondering how to edit music. I have a play list and it needs to be gapless and I need to be able to stop songs at a certain play time. I can do all this in itunes and put it on a cd but when I put it on my BB it doesn't save my changes and I can't figure out how to edit the songs when I plug it to my computer. Is there an app that can help me with this? I need to mention too that I am technicalogically challenged! :) thanks!