By default, guides are ordered in your channel based on each users' viewing history, and then guide popularity. So the most recent guide will show up first, followed by the most popular ones.
If you would like to have a set order for everyone, you can choose to reorder guides in a channel.
To order them, click on the "Sort Guides" button.
Select the guides you'd like to be ordered by clicking on the "pin" button on the desired guides:
The pinned guides will appear on the top:
where you can drag them to the order you'd like:
Click on "Save Sorting" to save the new order.
To remove ordering, click on the sorting button and unpin the ones you don't want to be prioritized.