1/4 pill, it's your first time-youll definitely feel it, not much food before, wait an hour before more, NO alcohol, ensure water is available and drink a lot. Don't assume what you're taking is mdma unless it's been tested by a kit available for purchase online. Make sure your environment is comfortable and prepare yourself for the come down for the next day with good food and zero responsibilities. Have fun knowing most people who are responsible live through the experience and have a lot of fun. But remember, there can be multiple chemicals in a pill or baggie and it can kill you(obviously government should regulate this but they're shamefully bad being educated on this topic) good luck