I would say just try not to sweat it (easier said than done I know).
Enjoyment of sex has a very strong psychological element (it's not all about physical compatibility) and if you aren't mentally getting turned on (because of stress or nerves, because of lack of attraction, because of tiredness or depression, because of self-loathing or insecurities etc) then very little physically is going to spark for you down there either. So if you worry too much about what its going to be like (and go into things with a pessimistic and overly-self conscious attitude etc), then you could very well ruin any physical pleasure that could have been experienced.
So have some drinks, get to know each other.
Do whatever helps you chill. Play a little background music.
Flirt, have a laugh, act natural.
Don't put too much pressure on yourself.
Explore each others bodies.
You may be meeting up for one sole reason, but that doesn't mean that you shouldn't take things at your own place, or that things can't be romantic.
Don't just go through the motions- do what what feels right for both of you (what you actually desire, etc).
Pleasuring him? Just get in tune with what he wants (which if you take things at a natural pace for you both, you'll start developing a sense for). Remember that confidence can be extremely attractive, but its not necessarily the same as simply playing dominant- a big part of it is about making the guy feel desired.
The first time you do it, may not necessarily be the best experience- it could last a very short time, or be very awkward (etc). But if you have a rest, chill and then discuss how it went and try it again later with adjustments based on each others feedback (and considering the circumstances, you might as well be pretty frank with each other!), then it can only go up from there (but nothing much will improve if you aren't honest with each other). Keep the advice tactful & productive too.
Don't be afraid to explore and indulge in some kinks either- everybody (whether they realize it or not!) has kinks (and indulging in kinks often makes the best and most satisfying sex of all).
PS: Be warned that if things do go great (and that you do end up meeting up on a more regular basis), that regular good sex with an individual can engineer hormones which can create a lot of strong feelings towards them (whether you want to or not) and that you could very well end up falling in love with the person if you have sex too much too often. Although it is extremely early days for you two, you should consider early what you'd actually do if such a situation (development of strong feelings towards the guy) were to occur (for example, is he someone you could ever see yourself being in a relationship with? If the answer is "Never!", then it might not be a wise idea to enter a no-strings attached arrangement with him either).