Yes, agree with Icuk, there isn't a single pathway. It is also very heavily depended on the devices and mobile PS you use. For instance, if you use iPhone and expect to develop an object C iPhone app on iPhone devices, that would be different. However, if you want to use dynamic-languages such as Python/Ruby, that will be possible, but it depends on the dynamic-languages supports for each mobile devices.

Cheers,
YJ