How to change my iTunes settings on my iPhone?

So I got an iPhone 4 last week and we set it up using my dad's apple ID. My dad and I share an iTunes account but have desperate apple IDs, however I couldn't remember mine so I used dads, assuming it would be fine since we share an iTunes account anyway. (I already had an iPod touch before I got my iPhone). But now my dad and I (dad has an iPod touch) share notes, internet bookmarks, contacts etc. So that when one of us ads or deletes a contact the same thing happens on dads iPod.
How do I fix this? Do I need to create a whole new iTunes account, copy all my music to the new account, then completely reset my iPhone and sync it to the new account. That seems an awful lot of hassle, is there any other way?
Also, please explain it simply, I'm not amazing with computers: L

How to get my iphone 5 earbuds to work?

I bought the new iphone 5 and I'm trying to use the headphones today and i'm only picking up the background sound not the actually speaking content. The only time i can hear the dialouge is when i hold down the middle of the volume button on the actual headphones. Other than that it is static or background noise.

How to transfer pictures back to your computer from an iPhone?

Ok so this should be easy right?! Yeah I thought so too. I have had a few answers but none of them were what I was looking for. Here some details. I had pictures on my computer. I decided to do a factory restore. So instead of losing my pictures I put them on my phone. They are not a part of my camera roll so I can't just import them. They are in the library of my phone. And there's no option anywhere to get those pics back into my computer. So I'm finding this very imposible do, however it should not be hard. I'm starting to give up and email 4-5 pics at a time to myself to get them back. Now this is going to take forever to do so if that's what I have to do. But I would like a good answer and possibly save me A LOT of time.

Can I still download games on an unlocked iPhone 4?

I'm buying an unlocked iPhone 4 because I will be using it when I travel to Mexico. Which I do it often. Would I still be able to download games? Like can I plug in the iPhone to my computer and download games from the apple store?

Samsung Galaxy S3 or stay with my iPhone 4S?

I'm thinking of getting a Samsung Galaxy S3. I've been on it in a shop a few times and it just seems much more better than the iPhone. It has voice commands where you don't even need to press a button to activate it, the screen is much clearer and more vivid, and has much better features too.

I had the iPhone 3G before my iPhone 4S, and although they look different, it just feels like i'm using the same phone because the operating system, and all the apps just look the same.

I'd like to try something new. Should I? Or shouldn't I?

How to put my pictures back onto my computer?

I did a factory restore on my computer so I put my pictures on my iphone. NOW, I want to put them back onto my computer. How do I do this? I didn't think it would be THAT hard or complicated. I don't want all those on my phone.

Is it possible to get more space on iPhone?

I have a 32gb iPhone 4 and sadly i've used up all the space. I've tried deleting photos, apps, etc, but still I have too much stuff. So I'm wondering is it possible to get more space on my iPhone without having to delete anything further, or having to get a new iPhone? Any advice or suggestions please.