After I asked her out for the first time, I wanted to send her a text message the next day. What should I say? (We like each other very much)

Generally good girls hate this kind of unclear relationship. Since you like it, make the relationship clear

You can ask her

What are you doing? ?

Where are you?

Or you can ask her directly, but you should start with happy things.

If you like her, be brave and chase her!

Come on and give strong support (*^__^*) Hehehe...