My iphone won't allow me to transfer any music. A lot more problems follow in the below paragraph

Hello all,
I really appreciate any help and advice I can get.
First my iphone won't allow me to drag music over to it. I'm old school and I like to drag specific tracks over to my iphone. iTunes won't let me do that. I have tried creating a new playlist and syncing again but still I can't do that. Any help or ideas?
Also, I keep getting the message that "x number of items could not be synced. See iTunes for more information". What does this mean???? I read some where that clearing the photo cache can help. One problem, I CAN'T FIND THIS PHOTO CACHE!!!!! Where is this thing. I read that you need to click "go" on the iTunes menu. My menu doesn't say go. What's going on? How to i find the iphone photo cache and get rid of that annoying message?!?
Also, before I get to any of the stages above, sometimes during syncing on iTunes with my iPhone 4S, it keeps getting stuck at "waiting for changes to be applied". Once again, anyone have ideas about how I can overcome this?
Please I need someone to go on before I throw this phone into the thames.

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