Under the subject of Tapping threads:
One "tool" I might suggest is a Tap/Drill size chart for easy reference.
It might look confusing for a beginner but, once you know how to use it you'll find it indispensable.
For example: If you want to tap a 1/4 - 20 thread.
Look on the chart under "Tap Size" and find
1/4 - 20.
Then, look in the corresponding column under "Drill Size" for the correct size drill bit required.
In this instance it would be a
Number 7 drill bit.
Now, you know which drill and tap to write down on your shopping list.
One 1/4 - 20 tap and one Number 7 Drill Bit.
Some tool stores will have individual tap & drill sets pre-packaged (with the correct drill bit and tap) rather than having to buy a complete Tap and Die set.
I always buy them individually...but, that's just me.
And, yes...whether tapping or drilling using some kind of lubricant is a must. Yeah, it can be done without and, you can be purchasing a lot of replacement bits, etc. too. So, get an oil can, wd40...anything is better than nothing.