On the Laravel News site there's a tutorial posted from Dmitry G. Ivanov giving you some helpful tips on building your first Laravel package.

Laravel is a powerful and modern framework. It has tons of different features, which make our work faster and easier. But you can’t push everything into the single box. At one time or another, we’ve all been in need of something not implemented in the framework out of the box.

[...] A package can be a solution. Write your code once and use it in any number of projects. Maybe you found a bug, or want to make some changes? Do it just once in your package code and then pull required changes in all of your projects. Sounds good?

The article then breaks down the information into a few different categories:

• The First Step (checking Packagist for something pre-existing)
• Development
• Testing
• Documentation
• Release

He ends the post by pointing out that there's several other things to consider when creating your package but they're a bit more in-depth than a short post like this could tackle.