You should be the one pursuing before sex, she should be the one after sex. (Not chasing)
About the texting, you can't be an ******* who never responds to texts but be busy. Don't chat with her over text. If she's showing you high interest and starts initiating more with texting you it's OK to initiate once in a while as well. Don't send needy texts, just show her you were thinking of her. And keep it short.
Ideally the first months of dating her the dynamic should shift from you initiating most of the time to her initiating all the time.
Be careful with using humor over text, however callback humor is great unless she isn't clever and doesn't get it.
Don't act like a robot who only texts for logistics and avoids all conversation.