I've talked to RNH about it a lot. Frankly you need to put yourself in an environment you enjoy and just talk with people. Say hi, introduce yourself, whatever. When I was trying to find people I'd go to board game nights. I met a good friend because we both ended up going to the same concert alone because both our friend groups didn't want to.
Jobbs said it earlier, just have a positive attitude and smile and people will react positively.
No need to overthink it either, if you find a conversation isn't going anywhere don't blame yourself and you can easily move away from it. Don't feel too bad if it doesn't lead to results with everyone.