I need some help

My new boyfriend wants to try abdl with me but i don’t know how to help him and start it . I want to give him some good tips and pointers and im trying to find good resources for him. But I only done abdl with only one person and he was my ex so im kinda scared to try it again. I just wish i had more insight to tell him and make him feel more comfortable with it. I’m just scared it will also change the way he sees me in his eyes and mind. So I’m very scared but im glad he wants to try it too. I just wish i had more info to give him and some tips and tricks to it . So please help.