just take a coupe shots honestly. mixed drinks take way to long to just drink and just chill sipping on it. and beers can be an acquired taste for some.
think of it like this, assuming you drink a 5% alc/vol beer that is 12oz:
one 2oz shot of 80 proof (got any vodka? those are 40% alc/vol) is equal to 16oz of the beer. since you've never drank before, take 2 2oz shots and you are in the 3 beer range (and since its going into your system a lot faster) you should feel a little change. this will get you an idea of what its gonna be like.
just a warning though, once you get drunk enough, it doesnt taste nearly as bad (and if it does you dont care anyways lol) and you usually end up passing out in your own vomit because you dont know, or dont care, when to stop taking shots.