What are the Four Critical Elements For a Landing Page?

I’m working on improving my skill at creating landing pages that convert – some simple pages convert at over 25% and others that I invest huge time into, don’t seem to convert at all…
I purchase PPC traffic, send it to my landing page, which squeezes an email address and starts a series of auto-responder messages promoting a Clickbank product with monthly membership…
I wanted to know if there are a few basic pointers or critical elements of a Landing Page that I should be aware of before I start trying to fix these lame Landing Pages that converting at 00.001%
Many thanks.
Doug

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