Jason,
I agree with Brent. Some of the more modern sets you can find the entire Orioles team set. If you are doing just Topps, you should finish that fairly quickly. But be warned, the bug might just bite and you will start expanding. I recommend going for all of the mainstream issues. I would start with Topps, then go with vintage Bowman. Then, you can go modern Bowman, Fleer, Donruss, Upper Deck, Score. All of those will be fairly easy. Then, you can branch out and start doing some of the harder stuff to find. Just a suggestion.
A great resource is the SCD catalog and teamsets4u.com.
A few great places to buy besides Ebay are sportlots.com and comc.com. Those are great places to buy commons and minor stars.
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