We are learning how to register our script as an extension so it can automatically load every time we start SketchUp. We also want to create a toolbar button and a menu item for activating our extension.
I am going to provide you with a template for you to download and use as a base for your extension.
The download will provide you with a .zip archive for you to extract and edit.
The most important step is step #3 because there is where you write your main script. Start by copying the code from my first or second tutorial and pasting it on line 8 in 'toolname.rb' file. Then after the files are in the plugin folder you will have a full working extensions with toolbar button and menu item the next time you launch SketchUp.
Then start experimenting by writing your own scripts and if you get stuck, go to a SketchUp forum and ask around. It's not important for you to understand what each line of code does at this stage but they'll become more clear to you.
If you want to accelerate your understanding of the code I recommend the following books...
Click the link and get a copy of this book, it will give you the knowledge to start coding with Ruby which is the language that SketchUp uses to create Extensions/Plugins.
This is the only book I know that is specific to SketchUp programming and I can't recommend it enough!
Below is the code of the template provided...
STEP 1 : Open and edit 'PluginName.rb'