Do you have to have some sort of doctors note? Or what exactly do you need to purchase?

A medical card will get you lower taxes and quicker entry. Otherwise, just have ID that shows you're 21 or over, it's recreational now.

Just be over 21. Medical cards are accepted from any state to avoid taxes

A valid ID from any state: I'm from AZ & was able to purchase flower & edibles.

Just valid State picture ID or passport and be over the age of 21 years old. You only need a doctor's note for a medical prescription and with a medical prescription but with a med patirnt card you'll save a lot on price and tax; nevertheless, now anybody in Nevada can purchase over the age of 21 with valid ID.