Would it be weird if I randomly messaged a girl?

[Unobia]

Basically, just start by saying 'Hey' or something. If she likes you, she'll take this as 'I may or may not like you but I want to talk to you' and she'll probably reply with 'hey' or something similar. Then it is up to you to get the conversation going. Try asking boring stuff like 'So are you on holiday?' or tell her about something you've done recently. Just try to get to know her, and when you start to get to know each other better, the conversation should just flow. If you want to ask her out, start by asking if she's busy this weekend/half term/holiday/whatever and if she says yes, just talk about that. If she says no, keep talking about normal stuff and if she shows more 'I like you' signs, ask her out. Even if she doesn't necessarily 'like like' you, she'll be flattered and at least you know. Things can always change for the better!