It takes a lot of courage to speak up, good on you for doing that.
Was there a particular detective or police officer in charge of the case? He or she would be the best person to ask questions, or the prosecutor.
In court, you will not have to talk to him. In some places, you won't even have to be in the same room as him. I don't know what country you are from, but in Australia, they can set up a screen somehow so that the survivor doesn't have to see the abuser at all, or the survivor can wait in a different room, or the survivor can be asked questions over a video/audio thing, so that they don't have to set foot in the same place as the abuser at any time during the case.
You will probably be asked questions by the prosecutor (that's the lawyer on your side of the case) and the defense lawyer (the person on his side of the case).
They may have a jury. Depending on your age, they may close the court so that the only people in there are the jury, the legal people (lawyers, judge, etc) and any other people who will be asked questions about the case.
GEORGE789 wrote:the welfare people were more interested in the destruction of a family unit
An abuser destroys their family. Regardless of what welfare did or did not do in your situation, it was the abuser who is responsible for the destruction of the family.
ETA: have just noticed the date you posted this thread! So by now, providing the case started when it was meant to, you'll already know the answers to your questions. How did it go?