Posted By:
tbobSteve has the right idea but I'd like to add 2 more suggestions:
1) Be on the lookout for bargain cards, even if they are something you don't collect as you can flip them and make money, either keeping them "raw" or spending $10 to slab them if they are nice and could get a good grade. They are also useful traders down the road.
2) Upgrade, upgrade, upgrade. Many times you'll buy a lower condition card and then find one in better shape and buy it, then turn around and sell the lower condition one for more than you paid for the higher grade card. Don't scoff, I have done this many, many times.
Good luck with your collection,
Bob