Nice start.
Get your blocking up to 68 natural ASAP. You should keep on training agility and stamina.
One of the things that stinks about the center is if you train agility and stamina, there is no good combination to train speed up later, so you may need to do some normal training on speed later on. Speed is needed for a center, although not super important. It would be nice for you to get this into the 30's by the time your level is in the mid 20's.
After you are done training speed, agility, and stamina, the only other attributes that matter are vision and confidence, which you can train while you are dumping your points into SA's. Don't touch the SA's until strength and blocking are up to 68 natural, agility up to 48 natural (maybe even 60), stamina around 40, and speed in the 30's.
