We did one in 2012 into the path of totality of the total solar eclipse.
http://www.joe-cali.com/eclipses/PAS.../index_p3.html
Due to the time sensitive nature of the launch, we had three teams operating.
1. Compliance and permission - negotiation and applications to CASA and Air Safety Australia. This was quite a lot of work. The CASA website has downloadable regulations with a whole section on balloons.
2. Launch team - configured the instruments and launched.
3. Tracking team - ham radio enthusiasts who used HF to track the radio beacon we had on board. .
Read the CaSA regs and then post your Q's here.
Joe