You can go as wild as you would like! Most folks are generally using Affinity or InDesign for layout, which have steep learning curves if you’ve never used them before.

The biggest issue with something like Docs is that it doesn’t do bleed or two page spreads. If you wanted to add bleed, you would need to add 0.13” to the paper size, making it 8.63”x11.13”.

You’d then need the margins to include bleed. You would also need a separate Doc for left and right pages. For the left page, top, bottom, and left margins would need to include the bleed, making them 0.38”, and the right margin would need to subtract the bleed, making it 0.67”. For the right page, it would be the same, but the left and right margins would be swapped.