Problem getting WP installed on my new own domain.

Hi!
I am new to this and it seemed all so easy, but I very much would like to through my iMac through the window after so many hours of trying and trying… 🙁

I bought a domain http://www.sanneschouwenburg.com and I would like to build this website with WP and have a blog :). When I try to sign up for WP it says my domain is already taken, of course… Im the one that took it 😉 So how to sign up if I have bought the domain somewhere else?

Then I downloaded the 3.5.1 folder to my desktop, changed everything in my 1and1.es administration area. Actually they offer a click-and-build option for WP but I don’t know why it is called that way! So then I have changed the wp-config.php file, and I have uploaded all the files to the ftp on 1and1, but nothing, it still says it cannot find my page. I tried: http://sanneschouwenburg.com/wp-admin/install.php, nothing..

Please help..

Thank you so much!

Sanne