From what OP wrote, they aren’t total strangers given he knows she likes comics. He sounds fairly young so I’m guessing she’s in his social circle or someone from school. If they were total strangers or just met for the first time, then yeah I’d say it would be a good idea to strike up a casual conversation or two before asking them out. You just really don’t want to develop strong feelings for them before you ask them out. It’s a recipe for pain if she says no, and can make things pretty awkward if they’re going to have to keep seeing each other regularly.