The electronic or programing side is not the main issue here, its the mechanicis of getting the balloon itself to 30,000M.
You really need to find someone local to you who is experienced in the subject and knows how to fill balloons safely, just right etc.
As an introduction you can experiment and do tests on the electronic and tracking side with foil party balloons. These are called pico balloons, around 36" diameter and when filled with just the right amount of hellium will rise to around 10,000M and float at that altitude for several hundread miles or more. Alternativly you add a little bit more hellium they will burst at altitude and you ge the fun of finding it again.