I've read that a simple "Hi." or "Hey." is a good opener. I want to try it but I'm a bit skeptical because what do I say afterwards? If I start with a comment about her (ie. "hey nice job on winning the volleyball tournament" or even "hi, I really like your earrings/whatever") it's easy to start a conversation.

However, using just the "Hey" leaves a blank after she replies. I can ask what class she goes to, what's her name etc. but I feel like that's just taking value instead of giving value and making her want to really engage in the conversation.

What would you guys do in this situation?