Google is indexing my sitemap :S and Need help with creating special pages

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Hey concrete5 community,

2 things:
Google has indexed all of my pages including the index.php/login page.
It's a little concerning, i'd prefer a straight search result to my homepage.

2nd thing - It is possible to make a page that users can go to after having made a payment. EG: I'm offering a service and then after they pay with paypal etc they get redirected to a "here's your product" page... And how do i stop google from indexing THAT page.. Because obviously if google indexed that page my service is out there for free!

Any help is greatly appreciated.

PS: I have tried the robots.txt file thing and i've set permissions to guest only for my homepage. It doesn't help or i'm just not doing things right?