Answer the following questions briefly:

Robichon decides to help himself by helping Jacques Roux. How?

Robichon put forward a deal to Roux to let him impersonate him and perform his speech at the cost of 500 francs and free advertisement. In this way, Robichon planned to win the hearts of the people of Paris by delivering a great act, and ultimately courting Suzanne, and also help Roux become a known figure by advertising his name and paying for him.