Analog and power-supply design projects can be daunting. Adding the logic required for mixed-signal designs often further complicates the development effort. Fortunately, you can take a divide-and-conquer approach to simplify the task.
Begin with a collection of analog subcircuits that you can adapt and combine into more complex subsystems. For the power-supply portion of your design, start with an online design tool that will help optimize efficiency, solution size, and cost. And finally, you can find brief, concise online tutorials to refresh your knowledge of the logic components you might want to add to your mixed-signal designs.