Wow, good luck. I don't think you should worry about uniformity. Get raw cards to start with, but don't pass up graded cards, especially for important cards( Cobb, Matty, etc.).
And don't be afraid to change your approach later. You can break out graded cards if you decide to do so. There are so many options that it isn't possible to make a decision now and not change your mind in some manner as your collection takes shape.
I can't tell you how many times in the last 12 years that I've changed. But my only real regrets are the cards that I didn't buy and now wish that I had.
I hope that helps.
