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You can get collections of reprints for some things. Try your local comics shop, explain the kind of thing you're looking for, and they can probably point you in the right direction. If they give you good leads, but don't have them in stock themselves, try someplace like Mile High comics online.
The best thing you can really do is pump your players for more info. What do THEY mean by "Silver Age"? Which comics do they feel best represent this? Do THEY have any of them you could read, or suggest other sources (ie "show X is what I want)? What specifically do they want to see, in terms of villains, events, themes, etc. ? What do they NOT want to see?
Otherwise, you may spend all this time researching and making a great star-spanning Green-Lantern-esque masterpiece of a campaign, and then have your players show up saying "Hey, I'm really going to enjoy this Silver Age game! Running into those corny theme-villains like Riddler will be a blast!" You'd have to either shoot them, or yourself.

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