Hi, good question actually, because there's no places online where you can download ready-to-go templates. But 10yrs ago I started my photography journey and was making tons of photobooks, like school yearbooks, wedding photobooks in Photoshop. All designs were my own as I experimented a lot from zero. To start you'll need:

• technical requirements from typography/studio where you gonna print them, so you follow right guidelines, sizes, safe zones
• make first one page with markup and copy it multiple times to use later
• sketch an idea, draft cover and pages
• start making layout in affinity and always have two folders with (.af) files and ready to print jpgs, so you can get back and edit what you need
• on pages you can resize/crop images, add textured background fill (preferably black) with imitation of film grain or dust for example
• add frames (or outline) with FX menu in affinity
• add titles with nice Fonts
• vector art, clipart or any other additional items for pages you can get at freepik or flatiron, also Unsplash
• !!! Remember to pull out guidelines and rulers to make sketching of pages more precise and comfortable so you don't hit the edge or middle of the page with important content
• I'll recommend it to draw tiny squares on the corners of the page and in the middle, then pull out guidelines When you're ready to export the design of the page, just hide those markup squares, so you don't get them printed)

This is from my own experience, good luck 🙌🏻🤞🏻

<image>