Breastfeeding question

Ftm and baby will be here in a week or less. I really want to breastfeed. How strict does my intake have to be while breestfeeding? I'm gonna try my best to eat healthy and drink lots of water obviously, but what if I want spicy tacos? If I eat beans or broccoli, will that put excess gas in him? What medicines are safe for pain relief? Am I still limited to tylonal only?