It’s a bit late now, but you should have immediately renewed your license after receiving the ticket. Your best defense would have been “I forgot, but I have already renewed it”. Since you didn’t do that, and you don’t have an attorney, and court is tomorrow, I’d just be honest, and let them know that you will go from the courthouse immediately to the DMV, or DoL, or whatever it’s called where you live, and renew it. Hopefully they don’t suspend your license for driving without a license. Other than that, get there on time, dress nice, comb your hair, don’t be intoxicated, or on any drugs, and refer to the judge as Your Honor. Good luck.