Just start your server and get confused? I know and I got you.

First Step: Flint

What you want to do first is to find yourself some gravel. Gravel is commonly found near water sources or underwater. Dig it up over and over, until you get flint. You will want to take that flint to a "hard" block (stone, bricks, etc.) and right-click on the top surface of that block to break it into flint shards. You will then want to break down leaves until you pick up a stick. You will need to take one flint shard and put it on top of a stick in your crafting grid, to get a flint knife.

Flint Knife Recipe

Plant Fiber and Plant String

You will now want to use that Flint Knife to break down some grass. This will give you Plant Fiber, which you can use three of to craft a Plant String. This is what you will be using to create your very first axe: A Flint Hatchet.

Plant String Recipe

Flint Hatchet

The Flint Hatchet will be what you will use to break down your first trees, in order to get wood

Flint Hatchet Recipe

Get a better tool

Now you have everything you need, just craft a Wooden Pickaxe, get some stone and enjoy the plugin.