Hello everyone

I`m looking for pro flautists to help me settle my confusion or rather, bewilderment. I love flute, and I`d really like to learn to play it, but I need to know many, MANY things now.

FIRSTLY
I know very little about brands and kinds of flutes, so I`d like to know what kind of flute I should buy. I:
1. Already play the piano. About to finish Grade 7 ABRSM. Rather good.
2. Am very serious about learning the flute (so plz. don`t go on about beginner flutes). Intending to get my diploma in both piano and flute.
3. Am young. 14.
4. Live right in the middle of nowhere; I don`t have access to a large variety of flutes here. I think I`ll probably order one from the internet.
5. Like all kinds of music, but I do have preferences. I`m not gonna go on about them, but I`ll just mention those for flute.
(a) I like flutes that have low, deep tone. So definetely not soprano here.
(b) I don`t want a squeaky little flute. I want the sound rich, deep, and powerful (I know you acquire that with time, but still, the instrument matters.. That`s how it is with piano anyway.. You`ve got squeaky pianos and bass ones).
(c) I`ve heard sth about some models forcing you to take the proper vertical position. I`d like sth like that. But does it have any disadvantages?

SECONDLY
What does it take to be a good flautist? Do you need to play with expression, have strong fingers, long breath or anything like that?

THIRDLY
Does being well-established in music (piano) help? I know it does, but how much, and in what ways?

LASTLY
Anything else I need to know?

Thanks in advance!