Sudo and su root not working

I want to use the sudo command but whenever I type it I see a message that says void is not in the sudoers file, this incident will be reported. I tried finding a way to fix it, and the told me to type su root then follow the next steps, but when I type su root it says authentication failure No problem, lets just fix that right? Well then they tell me to type in sudo which I cant use so I need a different way of solving this problem, would you mind helping me out?