I have a protruding chin and a large hook nose. What should I focus on first? I can only afford one surgery (Photo)

The best way to choose the one facia procedure for you is to do computer imaging. Have both the rhinoplasty and chin augmentation done separately and see which one looks best to you.

 The dorsal hump is composed of both bone and cartilage and can be shaved down with a closed rhinoplasty procedure. This will also accomplish decreasing the overall projection of the nose. The bridge of the nose requires osteotomies to narrow the nasal bones after the large hump removal. Also important to make sure the tip balances with  the new bridge line. For many examples and more information, please see the link and the video below

In terms of aesthetics, I think that you should focus on the nose first.You chin is strong but not unflattering.Further, chin reduction reduction is not done by most plastic surgeons since its hard to deliver great results.