iOS Developer Questions??

[Frostbit Yeti]

So I have already started making my app (I'm 17) and plan to actually publish it when I am 18 to pay for college, or have it under my parents name. But I have a few questions regarding things beyond my area of expertise.

Free app or paid? - I am planing on making an indie-type app, but do not know whether it would be an overall better experience if I made it paid or free w/ iAds and in app purchases.

Legal Jargon? - I'm definitely not a lawyer, so what should I worry about as far as copyrighting, trademarking, dev "companies" and those rights specific to them. Also, as far as making music, sprites etc, am I liable for any copyright infringement if I use photoshop to make a sprite versus say sketchbook or any other app?

"Company" - I see peoples names for their "company" a lot in the app store, but at the same time, other "studios" that may only be run by one person. If I was to create a pseudonym or other form of "company" would I have to separately copyright that too, or can I use it when publishing etc. regardless.

Obj C or C++? - I know C++ almost fluently and I know that iOS are usually coded in Obj C, but porting C++ over to java is far more do-able than having to re-write an entire game if i wanted to extend my app into the android market. Should I learn Obj C?

Potential Cost? - Aside from the $100 a year to have access to "Dev Stuff" and keep your app on the app store, will it cost anything more if I wanted to add Game Center capabilities etc? I already understand that it may cost money to pay for programs.

iAd? - how exactly do you add iAd banner capabilities to your app? I can't seem to find it on the internet.

Other notes: My cousin and I are making this app. Is there anything you would personally recommend to new developers? Personal experience based answers AND links are appreciated.

Thanks so much!