If you want to create a custom A5 spiral notebook with your own design and branding, here are the steps to follow:

1. Find a company that specializes in custom A5 spiral notebook printing. Look for a company that has a good reputation for producing high-quality notebooks.

2. Choose the number of pages, cover material and color, as well as the binding color for your notebook. Some companies may offer additional customization options such as bookmark ribbons or elastic bands to keep the notebook closed.

3. Create your custom design in the correct format for printing. Most companies will have design templates available for you to download to make sure your design is formatted correctly. Be sure to use high-resolution images for the best results.

4. Upload your custom design or logo to the company's website and select the placement of the design on the front cover. You may also be able to add additional customizations such as your company name or tagline.

5. Preview a digital proof of your design before finalizing your order. Make any changes or revisions you want before approving the final design.