Criminal Law Questions? Ask a Criminal Lawyer.
PC 243D is battery with serious bodily injury. That can get you up to a year in the county jail or 2, 3,or 4 years in state prison.
PC 417(a)2 is (essentially) brandishing a firearm in a threatening manner or using one unlawfully in a fight. That can get him another year in the county jail.
In most cases the DA will offer a plea bargain, but what that will be and the ultimate disposition of the cases rests on a lot of factors.
We don't/can't recommend attorneys here. In the end, at minimum he will have the help of the public defender.
I hope this helps.
The county jail is usually for sentences of up to a year. Fairly minor stuff. More than that and one is likely headed to state prison. As far as an attorney, the first step is that he will be arraigned, where they talk about bail, the charges are read, and an attorney will be assigned if he cannot afford his own.
Until then there is really nothing he can do. He is not expected to make any substantive statements at arraignment or even deny the charges.