I'd recommend doing MDMA since it's supposed to be more pure. (Same chemical, less transformed & cut, roughly)
But it depends on your supplier and nowadays you're likely to get fucked whatever you buy since it's your first time and you're most likely to not have decent "connections" that can supply a decent product.
Most likely your Ecstasy will be shit. Which isn't supposed to be dangerous, just less potent or just another chemical that will make you feel close effects to the real deal. Possibly a harder crash afterwards.
Let's say you get some good stuff, which I wish you:
1. Take it at a highly festive party. Like a techno set or a festival.
If you don't, well, you're basically wasting its potential. This drug shines in this context, that's where you enjoy it the most. (for 99% of people at least)
If taken in the right context, and if it's the real deal, you're gonna have the best night of your life. Until you do another one. kek
Takes between 10 and 30 minutes to "come up". Lasts between 1 and 5 hours depending on A LOT of parameters like how much receptive you're to it, how much you took, how good the stuff is.
Don't stress about it, just pop it and enjoy.
You're gonna literally sunk into pure happiness, it's much more controllable than alcool. It gives you a huge energy boost you're able to dance non stop through the night basically.
Just care, cause for the next 2 days you're gonna sore from your whole fucking body if you're not a hardcore sport guy. (yeah, dancing for 5 hours straight if you're not used to it fucks you up)
Some basic guidelines to remember at all cost:
DRINK
WATER
ALL
THE
FUCKING
TIME
and
You're gonna want to make love to everybody there so try to force the last 5% of your mind not under the influence to not be a total fucking jackass.
You won't have anxiety, just pure happiness. I'd say you "could" act sober if you focused a little bit and forced yourself to calm down.