Norethidrone tablets 0.35 mg “mini pill”

Dr prescribed me this birth control to take while breastfeeding and this is the first time I will have ever taken birth control pills and no nothing about them. I’ve only ever had the depo shot before. After taking them when can I have sex? How effective are they? Can I drink while taking them? What are side effects that I should expect? Will they affect my milk supply? I need to know just Ab everything. Supposed to start taking them tomorrow. If anyone is taking these can u tell me your experience or tell me some stuff Ab them