Let me start out by saying that I have never approached a woman, most of my relationships have come from meeting a friend of a friend or Tinder or something along those lines. I'm not really scared of approaching, I just want to know what I should expect to go down, and how to handle each situation that may happen. I've read countless approach posts, but I don't see these questions being answered:

How long should the interaction last before being closed?

Most of my opportunities would come when walking past a girl when going to class, is this a bad situation to approach?

What generic line or question works best after introducing yourself to the girl?

How important is it to be funny in conversation?

When I start approaching, I think I'd like to keep conversations short, maybe 3 minutes, before I ask for her number. I've also decided I don't want use Kino or make any sexual remarks aside from the initial "you're beautiful" or whatever variation of that I'd use as a pickup line while introducing myself. I see Kino as something that is used more in night game, not day game.

What do you guys think? Any practical advice? Thanks!