My manager just handed his notice, all his duties are split between 2 of us, Need an advice on what’s next.

So I started in this new company (a refrigeration units factory) less than a year ago, the manager was there for 9 years and he basically spent his whole career life there until he became a manager. and then he received a huge offer abroad. None of us under him has more than 15 months experience in this industry. The problem is that the company is welling to leave his place vacant and split his guties on me and another dude, although it will be super hard at the beginning but the opportunity is super interesting. How can I and my coworker benifit from this situation financially? And where should we satrt looking?