My advice?
1. Take 150mg and only 150mg. That is a very good starter dose for pretty much everybody. Also, do not redose, you will thank me later for this... I've gotten horrible hallucinations and hangovers after coming down after redosing only half my initial dose...
2. Don't plan anything, do it at home, take it, and do whatever comes to mind. My first time doing it I had a night of intense things planned out do to at home alone, but I ended ignoring those plans and dancing around the house in my underwear and touching everything for about 4 hours.
3. I'd say do it alone. Newbies to substances like this should always take it in a safe enviorment with no dangers. When I introduced my friends to the world of MDMA, 150-200mg lowered their inhibitions immensely. My guy friends that have girlfriends would think nothing of cuddling up next to me or hugging me tight or rubbing my chest or anything on ecstasy (I am also a guy...) so things can get pretty weird if you don't know how to control yourself...
4. Lights. Normally looking at a light would feel uncomfortable and weird, but any feeling like that on MDMA would be incredibly euphoric and intense. Just don't look into the sun.
5. Music. Music will make the euphoria so much stronger, I personally will listen to jazz or slow music while rolling, but the trend is for MDMA users to love electronic music with a fast beat and good base.
6. Strong tasting things are very amazing as well. Sure you won't be hungry while rolling and having food in your mouth can make you nauseous, but things like smarties, gushers, pixie sticks, fruit, and other strong flavors will be amazing. I prefer smarties and pixie sticks as they aren't really big, and they dissolve in your mouth.
7. Pretty much anything that makes you feel anything at all sober is enhanced. For example, bristly hair brushes or shag carpeting would feel incredible while rolling.
8. Have fun! Listen to your body while on E, what do YOU want to do? The fun about ecstasy is that it gives people a very loving, accepting, even silly feeling. I myself love drawing weird little scribbles that look happy while rolling, and my friend enjoys playing instruments while rolling, nobody experiences it the same.
CAUTION : You will not be discreet at all if this is your first time on MDMA, let alone any intoxicating stimulant. My first time I was sprinting around my house constantly changing tasks, and I would be babbling on about utter non-sense miles a minute.