I have broken down the process plan to various subsystems( including a Recovery system)but would want to know from the community what are the most important aspects of the rocket that one must focus on...
This is getting close-votes for being opinion-based, but I guess most people here will agree about two primary things; both "number one" because neglecting either is the end of the project. Law, and safety.
- Law. Countries have different regulations regarding rocketry, starting from complete ban, through necessity to be a member of a registered organization, get permit for any launches and tests, and so on. There is very little technical difference between a sounding rocket and a missile, so building one without proper permits can very easily get qualified as terrorist activity.
- Safety. I'd recommend the lecture of Ignition on how that kind of work goes. Accidents happen, and will happen. If by the end of your project you still have your eyebrows and all the fingers, count yourself lucky. Regardless, safety should be a priority, because with meticulous safety accidents will be rare and not likely to be serious. With anything less... say good-bye to your fingers.