The best advice anyone can give is to suggest that you should go to a phone shop with you father and have a browse.
Before you go, write down a few things that you want to be able to do with the phone. Mp3 player, decent camera, qwerty keyboard, touchscreen, etc etc..
Don't just assume that the iphone is the best thing out there. It isn't. But everyone wants one because Apple are so good at marketing.
In most phone shops they have replica handsets stuck on the walls so you can pick them up and have a good look at them. Chances are that you'll see one you really like the look of, and that'll influence your decision more than anything.
People on here will say 'get this phone', or 'get that phone' blah blah.. But in reality, it's you that has to live with it. So it's best for you to go to the shop and physically get hold of a few phones to see which one you like.
Also, a good website to look at is http://gsmarena.com
Since this is your first phone however, and your father is paying for it, i'd suggest that the first thing you need to be mindful of is cost. Not just the price of the handset itself, but the size of the bills too. Be responsible with how much you spend on calls/texts/bundles etc.. This is the best way to prove that you can be trusted.