urg advise

We finally divorced. My ex hus msg me yesterday that he transfered the $ for child maintenance. He asked me when can he meet the child. My f ex husb who never bother to come n see the child for 2 years. Now he wants to see the child. My child is 3 years old. I m concern how my child going to react wen he going to meet someone. What do i need to take note, becareful. Its a neutral meet up place aggreable. Pls help