If you haven't I recommend reading a few books on management even if you have zero interest in going down that path. It will give you more perspective on what you should be expecting from your manager, which in turn should in turn be what you talk about during 1-on-1s. I like The Manager's Path by Camille Fournier, though it could use more focus on the 'why' instead of the 'how'.

The best manager I had used a shared private document, where he would dump important points and expected you to add bullets as things came up during the week. This "you drive the conversation" is a good approach and one I intend to use in the future.

• What's really going on. A good manager should be aware people are inclined to present things as rosier than they are.
• Anything you are unhappy with. They should be fighting to keep you around, and how happy you are is a key piece. The sooner they know something is wrong, the easier they can (potentially) deal with it.
  • I'm planning a career shift into an EM role, and plan on simply being upfront about the Gallup 12 points (actually 13+4). They shouldn't confine themselves to them, but if a report is ever unhappy about any of them then I absolutely want to talk about it.
• What resources you don't have that you need to succeed.
• What ideas you have for initiatives. New projects, tweaks to reduce pain points, so on.
• Things from Above that you should be aware of.