Depending on your geography, local angel groups can be a good place to start as they will provide a pipeline of local startups and you'd have the opportunity to

Depending on your geography, local angel groups can be a good place to start as they will provide a pipeline of local startups and you'd have the opportunity to connect with other investors looking at a similar stage. As several have mentioned, co-working spaces or pitch events can also be a place to find deal flow. Oftentimes you'll find less experienced entrepreneurs with less formed ideas at these events. As an investor this presents a great opportunity to provide value beyond capital, but may also raise concerns as to the entrepreneur's capabilities. My greatest finds to date have come when I'm looking in a specific industry or at a specific problem statement. I'm a bit later stage than what you're looking for (Series A - small Series C), so I look for companies with a website (so they can actually reach customers) and search for news releases or any PR they've done. At that point its pretty easy to have an intro conversation and determine whether or not it's something worth pursuing. Regardless, it takes a lot of conversations to find the right investment candidates.