Kissing with tongue?

Hey guys so I got a little problem, I'm getting into a relationship with this guy and we are both really into each other. That being said, we are very physical, when it comes to making out it's all good but as soon as anything tongue related happens, it's all down hill. I have no idea what to do with my tongue. I tried YouTube videos but they don't help!! Please help? My guy is super caring and just tells me I'll get better but I don't even know where to start improving. Does anyone out there have any advice?