<human>: I know it's a super basic and very unrefined question, but how does a college freshman meet more people?

I've only had one relationship, and that started in high school (I consider that meeting a freebie). That relationship lasted about a year, and it ended about six months ago. I'm not certain I'm completely past it, but I think I'm ready to start putting myself out there and talking to/going on dates with new people.

I'm fairly picky when it comes to romantic partners, so meeting a couple of random people every month or two probably isn't casting a wide enough net. 

I've had a bunch of first and second dates in my dating career, but I've only met one person I liked enough/cared enough about to pursue something serious. Every other date ended in a feeling of neutrality or disinterest...A lack of spark.

The problem: I need to meet a lot more people than I'm currently meeting if I want to find someone else I have a connection with. But I just don't see how. 

I've had some success (and by this I mean I've tried it once and it worked once) just walking up to a pretty girl and asking if I could take her to lunch. I'm guessing that's not kosher?

How do I meet more potential partners?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Just getting over ex-girlfriend from six months ago, ready to meet new people. I just don't know how.