Read it to clearly understand these things:
How to install the driver
Verify how it will connect to your computer this is especially important if you are using a pen display.
For a pen display, you may want to use it with a single USB-C cable. Verify this in the manual. and if your computer has a USB-C port that supports DP-Alt Mode. More here: Connecting a pen display with one USB-C cable.
If the tablet supports wireless, how to initiate a wireless connection
Ensure you know how to contact customer support.
Ensure you know the warranty and how (if needed) you can can return the tablet to the manufacturer or to the retailer (example: Amazon) you bought it from
Here's a list of Common problems with drawing tablets. Although for a majority of you everything will "just work" some small number of you will start off with issues on day one.
I have a list of troubleshooting docs here: Troubleshooting
The most complex problem for pen displays is usually the "NO SIGNAL" problem. If it happens, this guide will help: Troubleshoot the NO SIGNAL problem
Never purchase a tablet without looking at the reviews first.
Some reviewers to explore:
Teoh on Tech (https://www.youtube.com/@teohontech7141) Teoh has the most in-depth reviews of tablets.
Create Now Sleep Later (https://www.youtube.com/c/Createnowsleeplater)
Brad Colbow (https://www.youtube.com/c/thebradcolbow)
Aaron Rutten (https://www.youtube.com/c/aaronrutten)
Adam Duff (https://www.youtube.com/@AdamDuffArt)
Tablet names are confusingly similar. So much so, that I've seen people order the wrong tablet just because the names were close.
NEVER order by using the name of the tablet alone.
ALWAYS verify you have ordered correct model number.
See this page for all the reasons why you should not rely on the model name: Model names vs model numbers
Check for potential sources of Electromagnetic Interference. More here: Electromagnetic interference
Ensure you have enough space on your desk for the tablet and where your keyboard will be placed