New to paypal - need direction

I'm new to paypal and coding for payment gateway. I dont know what the steps are. I think first I need to download paypal's SDK?

I also found this sample code. Anyone's used this?
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Dave BaldwinFixer of ProblemsCommented:
You need to sign up for a Paypal account (it's free) so you can get access to their developer code and tools.  That sample code in your link is from 2007.  I believe Paypal has current sample code that should be more accurate than that is.

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CamilliaAuthor Commented:
I signed up for the sandbox, is that what you mean?
Dave BaldwinFixer of ProblemsCommented:
Yes, that's part of it.  There are code samples there somewhere on one of the Developer pages.
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