Wieght Training Advice

Hello my name is Ken I am 44 years old and  I have just begun fire fighter 1 class.   am over weight and I am looking for advice from others to help figure out a good healthy diet plan to try and lose weight while I am in the middle of classes. I want to lose weight for myself and so I do not put others at risk while fighting a fire or any other activities. Please help a fellow fire fighter with this. Thankyou for taking the time to read this.  sincerly Ken.