To what places?
You're going to have to figure that out for yourself, based on what you've got around you. Where are single men in your target age range likely to be? Restaurants, movie theaters, gyms, activity clubs, parks, out walking their dog, pool halls, bowling alleys, and, yes, in the UK, often in pubs. You've got to adjust where you go and where you spend that time based on who you're trying to find - don't go to a college bar looking for 40 year old guys, for example.
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How did you do it
Where do you find them
Mostly in our local pub. People tend to gather there for drinks, dancing and meeting other people.