I'm not that knowledgeable on PHP, java, ASP, etc.. so I was wondering if someone could point me in the right direction on what I need to learn to write this.

Ok first of all, I'm making a site where a user can register an account and have a personal user control panel.

1. what web langauge do I need to use to make something like this? php I'm guessing, right?

2. I need to write some kind of script that will, on request of a registered user, go to a specific site and retrieve specific data and return it.

3. I need to write something that will compare the data retrieved by all the different users. (basically what I'm doing is comparing all the different data of the users and give them a rank based on how they compare to the other users.)

I'm not looking for anyone to write it for me or anything, I'm just curious what I need to learn in order to do it. Or if you have any helpful links, or tutorials that would be awesome.