I guess it depends what country your in for drinking age/scene your encountering women at. If your with m in a drinking environment like party or bar drink to get lose, no need to get wasted. Good body language give them attention. I would say some pretty dumb things when I was younger and out with girls at the bar. One of my friends didnt understand how I was taking them home, but it was because I was showing that girl attention when other guys were either too intimidated or thought she wouldnt be into them. Just feel em out if their engaged in talking with you when out and you keep talking to them for most of the night their going to think your into them without having to say anything. If they arent interested youll know.
Also what works good for your age range is snapchat. Fuck I'm 26 and its been pretty clutch for me in times.