How to change itunes accounts for iphone?

My dad recently has been getting my texts instead of me. If i change itunes accounts will that solve the problem? I also have a few other questions.
1. Will all my music and pictures be transported?
2. Will my iphone still have icloud connected to my old itunes account? (Like will the new music I buy on my new account still transfer to my old account, if so, how do I stop that from happening.
3. Will my dad still get my texts?

Your dad getting your texts has nothing to do with iTunes. You need to call your carrier to resolve that issue.

If you're talking about iMessage,
That means your iTunes account e-mail,
that you use to receive those messages is on your Dad's iPhone,
What you do is, Go on your Dad's iPhone
Settings > Messages > Send & Receive
and take your email off.

If that's not that case,
Then call you cell phone carrier and ask them about this issue.

Go in settings

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