simple, short and easy! 10 points!?

I'm fairly new to the dating game, but there's a girl who I've been hanging out with and I like her and I think the feelings mutual. I've only texted her to set up times to meet. I avoid texting conversations because I've been told that detracts from your value in a girls eyes. I'm trying to build up tension and create a sense of mystery. Is it alright if I tell her I think she's cool and enjoy hanging out with her? or would this destroy everything I've worked towards?