Should I appoint an advocate for 279. 337 ipc case

My son had met an accident when he has riding his vehicle with his friend, a girl riding her vehicle in front of my son's vehicle and suddenly she has taken right turn without indicator, my son who could not avoid due to her sudden action/turn hit at her middle of vehicle. Nothing happened to her whereas my son suffered forehead wounded and treated with stitches. Both the vehicles were almost equally damaged. Vehicle is in my name with valid comprehensive insurance, RC and my son's valid DL. Though we were prepared to settle by giving some money to the girl's father he has rejected and demanded more money. Finally her father has given the complaint and FIR has been made. We have also given the counter complaint immediately, but the police has given us just acknowledgement. No FIR has been made based on our complaint. We have also spent a lot for my son's new spectacles and hospital charges and vehicle repair. Now we have received summons from court to attend on 8th May. 1) Since the girl (around 21 yrs major) alone riding the vehicle without pillion rider, can her father who was not at the spot at the time of accident, give the complaint? 2) Should we appoint a lawyer? 3) One of my friend advised to settle the matter as plea guilty (though we are not guilty). What is the procedure: 4) My son and that girl both are degree students (exams are there during May'19 5) Will this FIR affect to obtain passport or visa to my son Please advise.