You have to file suit in Fresno (since they are located there, that is the venue...or place you need to file the case)
There are two ways to approach this. Once, you can "do it yourself". This is possible in "small claims court"
Small claims is a true "peoples court". The formal rules of evidence and procedure do not apply. So you can represent yourself (no need to hire a lawyer).
The process is simple enough. You head to the court (in Fresno) and talk to the clerk of the court. They can get you the forms needed to start. You file the claim, serve a copy on the defendant and wait for your day in court. Since you are out of state, you can try contacting the court to see if they can send you the forms and allow you to file by mail
In court, be prepared to tell the judge what happened, and bring in copies of any evidence that supports your case. IF there are witnesses who can testify about what happened? Have them come as well.
You can sue for up to $7.5K in small claims (but you can not sue for your travel costs)
OR you can hire an attorney to assist you. This makes it easy...you can find an attorney here
Through the county bar...or you can use this service
To select a lawyer to represent you
Please let me know if you have more questions. I am happy to help if I can. Otherwise, please rate the answer so I may get credit for my work.