Home security system related help

Hello

I am a newbie to Arduino. I want to make a home security system. I want to connect an lcd display, 6 reed switch (NC/NO type), 2 PIR sensors and a GSM module and a piezo buzzer for alert. How to connect it?
How to power arduino board? In which software should I program it and how to transfer to the board?

Thanks in advance.

why no one is replying? Have I posted it to wrong place? Pls let me know.

I would suggest you start with a at simpler project.
The reason no one has responded is because you have not provided any specifics of the hardware you intend to use.
Arduinos are programmed in C.
Are you familiar with C.