My sync is not working

I purchased books from Audiobooks. I went to sync my phone. It was an endless loop so I cancelled the sync. I went on to delete some apps, songs, etc to give my iPhone more space. Now when I go to sync it only has "other" like that is the only data on my phone and sync is grayed out where I cannot try and sync. I have already restarted the computer once. Help Please...Anyone! Thanks in Advance!!!! Staci