High speed Planetary Gearbox Design

[planetaryroks]

Hi

I am designing a planetary gearbox with specification given below--
1. Maximum torque- 55 Nm
2. Maximum Rpm - 6000 rpm
3. Average rpm - 3300 rpm

Since it is my first Experience to design a planetary gearbox i don't have much knowledge on how to design it exactly on industry standards.So i want to know how i start and complete my design

I am very thankful for any help regarding this.

Thanks