@Sparkman Thank you!

I had forgotten the resistors. Yes, I was planning on using MySensors. What is the NRF radio module used for?

I have narrowed down the components.

I will use:
Arduino Uno
SparkFun Audio-Sound Breakout - WTV020SD
3 red LEDs
8 ohm speaker
3V AA Battery holder

Am I forgetting anything? Do I need a capacitor or a step up/step down regulator?
Any suggestions is kindly accepted.
Thanks.

Hello,

I am new to this type of project and I could use some assistance. I have watched a lot of videos and I think I am capable of figuring it out.
Since this will be my first project of this kind, I was wondering if I could maybe get any suggestions on what parts to use to put it together. Or any suggestions to get me started in the right direction.

What I want to try to do is this.
I want to put together a motion sensor that when triggered will activate 3 LED's and a looping sound. I want to be able to put this inside a halloween decoration so I want to attach it to a battery of some kind. I don't want it to be big or bulky as the decoration will be about pumpkin size.

Thank you in advance.