How to download mp3skull music to my iphone?

Okay so i imported about nine songs from mp3skull to itunes. But whenever i try to sync my iphone using only selected songs, the nine i imported don't show up? Am i missing something?

Is there any good iPhone app that helps with fitness and nutrition?

I have an iPhone and iPod and I want to know is there any good fitness and nutrition apps from App Store. There are so many and I'm not sure what ones to download. They can be paid and free and they can be in the uk store and the us store. Please help! I would like the apps to make me lose weight and gain muscle. Also are there any personal trainer apps?

My iphone 3gs volume don't work they only work when you put earphones in?

I recently repaired my 3gs because all the buttons were broken. But they still had worked i just needed buttons on because it was hard to put the volume up or down. So when all the buttons were fixed i can only use the earphones too adjust the volume from the side if i take the earphones off i can't hear my music or game sound… So how do i fix this?

Can I swap my black iPhone 5 for a white one?

Okay so, a while back my phone's power button messed up. I still have a warranty on it and I'm going to send it back for a new one. If I want a white one instead of another black one, will Apple give me white instead of another black?