The fastest way to change the WB normally is using the i button on the back. Otherwise it needs to be changed in the menu.
More info can be found here:
Alternatively you could use the Fn button to change the WB. This can be set in setting F1 of the menu.
Not precisely what you asked, but one of the main reasons to shoot RAW is that you can change white balance in post at will. From RAW you can make any equivalent change that a preset used shooting JPEG would.
What this does mean is that you move the issue of selecting white balance to post processing. At that point you have the widest possible latitude for ...
This question is very unspecific, but I will anyway try to answer.
I will just assume that you want to start with shooting wide-angle photos, e.g. the milky way.
What you need
A camera and lens (obviously)
A tripod: In order to shoot the long exposures needed to capture the faint light of stars, you need something to put your camera on, to avoid camera ...
For Mac users - a new webcam app.
I'm adding this to existing 'webcam' questions for future searchers.
I am in no way affiliated with this product or the company making it - this is a simple user to user recommendation.
I just discovered this today, announced on DPReview a new product called Cascable Pro Webcam £40 [£30 for the first week to 24 July 2020]