As Lee and Steve have mentioned before there are many ways in collecting the T205 set. I am 15 and my dad and I have been working on the "Master Set" since February.The "Master Set" is made up of all the variations that are in the set. The master set is made up of many different types of cards that consist of very small things that some don't even notice.Some Examples:---Moran Stary line of type below stats------Dougherty White and Red Sock Emblem------Barger Partial and Full "B" on cap------Bresnahan Mouth open and mouth closed------Dolly Gray stats and no stats on back------Shean "Rustlers" and Shean "Cubs"------Wallace 1 line of 1910 stats and Wallace 2 lines of 1910 stats---Those are a few examples to help you out on the variations that are in the "Master Set"As for collecting I have been trying to put together the Dockman set which is a blast. I am up to 24