Here’s a couple of things regarding sequential projects:

• Keep future actions in your project support. You don’t want to keep them in your head. It feels nice when you can open an outline or a mindmap (or whatever), and you can effortlessly add the next action on the project.
• Get into the habit of capturing. When you complete one next action, you should grab the next one into your inbox since some part of your world changed. You have new information that you should pay attention to.
• Weekly reviews are the safety net for still need to capture things.

I know some apps like OmniFocus let you add future actions that magically pop up in your next actions lists when you complete a previous one, but they do more harm than help. Almost every time, the next step needs processing anyway, so these subsequent half-baked actions that you add in advance are going to create less trust in your next actions lists.