Troubles to move turtlebot_gazebo

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I started a small project where I wanted to move the turtlebot in gazebo. I launched: roslaunch turtlebot_gazebo turtlebot_world.launch

I wrote a code to move it:

#include "ros/ros.h"
#include "geometry_msgs/TwistWithCovariance.h"
#include "nav_msgs/Odometry.h"
#include "gazebo_msgs/LinkState.h"
#include "geometry_msgs/Twist.h"

int main(int argc, char **argv){

    ros::init(argc,argv,"move");
    ros::NodeHandle n;
    ros::Publisher move_pub = n.advertise<geometry_msgs::Twist>("moving",1000);
    ros::Rate loop_rate(10);

    geometry_msgs::Twist msg;
    while(ros::ok()){
        msg.linear.x = 0.0;
        msg.linear.y = 0.0;
        msg.linear.z = 20.0;
        move_pub.publish(msg);

        ros::spinOnce();

        loop_rate.sleep();

    }
}

This doesn't work. As you can see i included other msgs and tried it with them but I got the same result. I also tried to find the node turtlebot_teleop_keyboard to find out how it is done by inputs. But i couldn't find the path to it. So what do I have to do to move it? And how can I find the path to the node?

Thank you in advance