How much should I take for my first time

Me and a friend of mine are looking to try Molly for the first time, me(70kgs), friend(65kgs). How much should we take and how long does it take to kick in and how long does it ussually last

***SECOND QUESTION I’ve only ever drank and smoked bud, how do I take it safely(snort, swallow?) and does it affect anything(breathing, using the toilet, drinking/eating, sleeping?)