Breastfeeding Question??

Hello, this is my first baby & I am breastfeeding. I was wanting to ask all the mommies what steps do I need to take if I would like to have a glass of wine or beer? What is safe am I able to do this? I keep reading a bunch of different things online to yes pump and dump , no need to. I just want to know what is going to be safe for the baby and if anyone's physicians gave any advise on this topic. I'm not in a hurry to drink I just want to know for future reference when I feel ready to have one here or there. Thanks in advance :)