Work on tutorial

docs/making-a-mod.md

@@ -1,3 +1,34 @@
 # Making a Mod
 
-This guide assumes you have already gone through the [getting started guide](getting-started.md). It will walk you through the basics of using TMT to create a mod.
+This guide assumes you have already gone through the [getting started guide](getting-started.md). It will walk you through the basics of using TMT to create a mod. Let's get started!
+
+## Setting up mod info
+
+Open mod.js. This is where you define things that are for the mod in general as opposed to layer-specific. For now, modInfo, you can set the mod name and author name, and also the points name, which changes what the game calls your basic points (but they're still referred to as points in the code). Be sure that you set a mod id as well.
+
+## Making a layer
+
+Now for the good stuff! Head into layers.js. There is a basic layer already there (although it has a few redundant things in it.) Let's see what it's doing...
+
+The most important thing is on the first line, where it says `addLayer("p", {` . This is how you create a new layer. The "p" here becomes the layer id, which is used throughout TMT to refer to the layer. You can change the id, but you will have to replace instances of "p" in the tutorial code as well.
+
+A layer is basically a big object with lots of different properties that you can set to create features. For fun customization, you can change a few other things:
+    - name: Your layer's name!
+    - color: Sets the color of a lot of things for this layer.
+    - symbol: The text that appears on this layer's node.
+    - resource: The name of this layer's main currency.
+
+Reload the page to see your newly customized layer! You can ignore the other features here, for now. Most of it is involved in calculating how many prestige points you get. For now, let's make an upgrade!
+
+## Upgrades
+
+Upgrades are one of several Big Features in TMT, and most of them work the same way. Most of what applies to upgrades applies to milestones, buyables, etc. To add upgrades to your layer, after all of the other features, add a comma to the end of the last one, and then put:
+
+```js
+    upgrades: {
+
+    },
+```
+
+"upgrades" is an object, which contains an object for each upgrade. Each upgrade has an id that corresponds to its position. The upgrade "12" will appear as the second upgrade in the first row.
+