Minnow Support Project is a group of people who combine their powers of good (by delegating steem power) to be used on tiny accounts (minnows).
Here on the steem blockchain we refer to ourselves as different sized fishes (for whatever weird reason...). When you FIRST arrive and have little to no steem power (vested steem) you are a minnow. As you earn rewards and power up your fish status changes.
The MSP helps new people by showing them around and giving them upvotes when they may not be seen otherwise.
I WOULD suggest to join Discord. For better or worse it is where we congregate.
Let me know if you have other questions!