I am astounded that a 27 year old is asking me how to get started with cold approaching. When I was first coming into the sexual marketplace as a teen in the late 1990s/early 2000s, most men knew how to do a basic approach by ages 18-20. When I first got to college in 2001, I was starting to see signs of slavery to technology, as I was seeing people sending instant messages on AOL Instant Messenger (a pre-cursor to text messaging) and not having as much in-person contact. In my freshman and sophomore years of college (2001-2002 and 2002-2003 school years), dating websites were still stigmatized but the stigma was quickly evaporating. In 2001-2003, the people who were using online dating websites were post-college older people, not college students.
The first thing that I recommend doing before cold approaching is enhancing your looks. Game is some combination of looks, money, status, and personality. Younger women tend to value looks above all, though you could play money and status game as a trust fund recipient. Even as a trust fund recipient, having a good body will take you far. Be active in some sort of exercise activity to lower body fat and build some muscle.
Then, the next thing that I would recommend considering are your own goals for relationship. That also impacts what channels you can use. Wheat Waffles has a great video about which actions you can take based upon your own goals in romantic interactions.
After that, it comes down to thinking about the women you desire, the lifestyles they live, and where the women you desire are most likely to be found in-person. You need to go where the women you desire go in real life.
One of the easier venues for working age adults is fitness classes. The environment of a fitness class roughly resembles either a high school or a college class. Most men do their first approaches as a result of high school or college classes, so there's something in the venue that's familiar. It's an easier approach to approach a woman after a fitness class as compared to a woman at a mall, bookstore, or grocery store. Find a class format that you like and start approaching. There are more women than men in most fitness class formats. Begin interactions with an observational comment or question. The most difficult part of fitness class approaching that women aren't as sociable before/after fitness classes as compared to before/after high school or college classes. There was even a recent SoSuave article about fitness class approaching.
20 girls for every one guy. And almost all of them are supermodel beautiful.
www.sosuave.com
In high school and college, extracurricular activities/clubs were a decent way to meet women. As a working age adult, you still have some options that resemble those, but they are more difficult to explore. Co-ed sports leagues are one of the more common ways that people in their 20s/30s try to find romance. I have written about meeting women in co-ed sports leagues many times, so I won't go into it here. There are other activity groups outside of co-ed sports leagues. It depends on your interests. The only warning that I'd give with using social type groups to meet women is to avoid any group that is affiliated with Meetup.com. Meetup.com is a shiit platform. Women like to do what is cool, and Meetup has never had a cool factor. In most general social groups on Meetup, it's a bunch of horny/thirsty losers swarming the 1-2 average looking at best girls who go to the events. Most of the girls who go to events are subpar. Avoid Meetup groups.
After this, you might want to consider pursuing approaches in nightlife venues.
The hardest form of approaching is unstructured, non-bar approaching, whether it is indoor (general gym floor, grocery store, mall, etc) or outdoor (street, park, walking/hiking path). You need more advanced game to do these approaches. Outdoor non-bar approaching is the absolute most difficult form of approaching you can do.