1. If you are not going to print Pages is fine, as it does not have adequate color control for cmyk.
2. Work with images at 72dpi actual size, this will mean sizing a placeholder image then correcting and cropping a final version from the original, outside Pages (Preview is perfectly OK for this) and reimporting the edited image for the final publication.
3. Create a grid and stick to it. Unfortunately whilst Pages has guides they are pretty useless as they are retained in duplicated pages, or layouts. However Pages auto align is superb, way better than Adobe's.
4. Pages allows links to URLs and has bookmarks, all retained when Printed to pdf.
5. Copy/Paste/Retain styles has become a total PITA in recent versions of both Pages and macOS. You will need to create and impose your own styles. You can only use the f-keys as Style shortcuts, so those are limited to 12 total.
6. Use Pages '09 for Layout not the latest Pages 6.3. Pages 6.3 lacks facing pages, master layouts, textbox linking is unidirectional, and is subject to massive slowdowns when the layout gets busy. It still lacks a long list of necessary functions. Pages '09 has extremely good "Captured Pages" which are multi page repeatable layouts. It also has layout breaks which allow you to finesse a wide range of layouts with a bit of work. Templates and placeholders can really be made to be fast and efficient.
7. Use Pages 6.3 for Vector Objects the tools are good, and you can do a lot with the snap align and boolean operations. Not up to Illustrator but very useful. Those vector objects can be Exported back to Pages '09 documents and used in layouts there. Pages '09 has vector tools but no Boolean functions and is more clumsy than Pages 6.3 for this. Pages '09 is much faster handling many objects, cruising along happily where Pages 6.3 throws up a spinning beachball after a while.
8. One thing you will find strange is that no version of any Apple software has intelligent color control. Pages 6.3 actually got worse at this than Pages '09, so whatever you use there will be a bit of manual work trying to keep colors consistent. I have worked hard at trying to use named swatches in the Color Picker but it is handicapped by not acting as variables simply as storage for reuse and they are not portable.
9. Keep in mind that Pages and Quark XPress are two completely different beasts. Use Pages good features and don't pine for the more professional Quark tools.
Peter