Question about parts required for a project

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I am quite new to electronics and Arduino, but I am eager to learn.

I recently saw [this project and I want to make something like this for my office, but with more features and shorter. I just wasn’t sure of all of the parts required after the big components.

I plan to make a LED sign that is about 2-3 feet, with a speaker, flashing light, and a button. Once the button is pushed a message is displayed and the speaker and lights go off.

I ordered the following so far:

What I’m not sure of what else to get are the small things that aren’t explicitly mentioned or are possibly a “given”.

I know I will need solder, a soldering iron, a power cord to interface with the PSU, possibly wire nuts, jumpers, and that’s it.

The other question I had was about this [Big Dome Pushbutton. The description says it is 12v, would it work with the 5v PSU I have or would it barely glow when pressed?

Also, can anyone recommend a decent speaker that could be heard well across a room and a light similar to [this and work with the PSU I already got?

Is there anything else I might be missing? I am open to any other advice as well.

Thank you!](https://images-na.ssl-images-amazon.com/images/I/61dRV5K3cnL._SL1275_.jpg)](Big Dome Pushbutton - Green - COM-11275 - SparkFun Electronics)](Arduino Uno - R3 SMD - DEV-11224 - SparkFun Electronics)](LED Strip Pigtail Connector (3-pin) - CAB-14575 - SparkFun Electronics)](Amazon.com)](LED RGB Strip - Addressable, Bare (5m) - COM-12026 - SparkFun Electronics)](Bigger is better: Build an Arduino-powered monster scrolling LED sign for about $15 a foot | josh.com)

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A reviewer on the product page says this about the big dome pushbutton:

They’re set up for 12v, but you can replace the resistor to use other voltages.