This is a ready-made and excellent bot base for AutoIt, Some of its main features are:

1. Uses an excellent IRC lib (or UDF) which supports Custom Logging.
2. Easy to read, understand and modify.
3. Lightweight and fast!
4. Made with best coding practices in mind.
5. Built-in Authentication System
6. Separate file for easy bot configuration.
7. Flexible and highly modifiable.
8. Does not require any other external software.

...etc...

If you don't believe me, take a look for yourself!

1. Rename Config_example.au3 to Config.au3
2. Open Config.au3 using a text editor (SciTE4AutoIt3 preferably)
3. Read the comments and follow them to complete the configuration
4. Run Bot.au3

And that's it!