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Again, you can even avoid using the wizard by using the altera_mf library. It gives me more direct control, and less extra rubbish/wrappers cluttering up my working directory (though I know some people prefer setting stuff up via the wizard)
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all of the generics can be found via help -> megafunctions/lpm.
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Be aware that the altera_mf library is functional simulation models. It is not intended for synthesis.
The MegaWizard has the advantage of preventing some illegal combinations of parameter settings. If you choose to instantiate megafunctions directly instead of using a MegaWizard variation file, you can still create a MegaWizard variation file to get a correct set of parameters/generics that you can copy to your own file where you are instantiating the megafunction like altpll directly. If you don't use the MegaWizard at all, then see the on-line help page for the megafunction as Tricky mentioned or see the user guide for it at
http://www.altera.com/literature/lit-ip.jsp to see what the available ports and parameters/generics are.