Hi,
As you said it yourself, check Seller University by clicking through Performance on Seller Central. This should give you lots of hints and tips about selling on Amazon (many, MANY videos and tutorials). As for other tips, well, check every similar discussions here on the forum, they might provide some help. Although, keep into account that everyone’s experience on Amazon might be A LOT different from yours, depending on many factors (such as selling plan, selling category, competition etc.).