How to put the music from my iphone to my pc?

I have an iphone 3g (yes I know it's old but it's basically my ipod) and I'm wanting to transfer the music from it onto my computer. Onto the computer itself or itunes I'm not fussed but I just need it on there. Need this to be free as I'm broke.

Transferring data onto another iPhone?

I have to get a new iPhone. I'm sending it back and getting a new one. I have things like photos, music, etc on my phone. I know music and apps are easy to put back on but there are notes, game data and contacts. I also have my stuff backed up onto iCloud, how would I put stuff from this phone onto my new one?

Found a iPhone 5 what should i do?

I found a iPhone 5 on a bus yesterday, It had a lock on the home screen so i could not call any numbers on it. I'm thinking of selling it but i feel really bad about it, I know i should bring it in to the police station, but i could really do with the money. What do you think i should do?

My iphone 3gs has trouble connecting to the internet?

I just got an iphone3gs 2nd hand from a friend just until my contract goes up because my bb broke and its getting easily confused when I thought apple was supposed to be an intelligent brand?

I linked it up to my home Wi-Fi which works great but when i'm out of range of my Wi-Fi the phone doesn't recognise this and automatically start using its own mobile internet. How do i get it to do this, the only way I get it to link to its own internet is by turning it on and off again when outside the house, any ideas?

Photojojo camera lens for the iphone?

I was planning on getting the photojojo magnetic camera lens for my iphone 5 and i was wondering if you can take off the metal ring after putting on your camera lens.
Like if you have finished taking a picture with your camera lens and you take the lens off, can you be able to get the metal ring off when it is stuck to your phone by the camera? Or does it stay there forever?

Please help me! I really need to know this else i won't be abe to get it!

How to connect your iPhone to iTunes when it is already set up?

I have an iPhone 4 which I set up without any wires but when I try and plug my iPhone into iTunes it asks me if I want to set it up as a new iPhone or restore a backup. I don't want to do any of this I just want to connect my iPhone to iTunes so I can transfer music I have not purchased with iTunes.