How Do i Run My Own Program

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You should start with the ROS tutorials to understand how topics, services and actions work. Depending on how are you going to give commands to your turtlebot (using the topic or using a service or action) you are going to need the appropriate API for that. Topics: http://wiki.ros.org/ROS/Tutorials/Wri... Services: http://wiki.ros.org/ROS/Tutorials/Wri... Action client: http://wiki.ros.org/actionlib_tutoria...

I wanna run my turtlebot3 using my own python program, how do i begin?

Did you look at the Turtlebot 3 tutorials?

what do I need? any tutorial or book that I can read?

You can have a look at this book, It is providing detailed information with code. You can get a list of books by ROS.