Outside from the other informative posts others mentioned with hardware and cloud mining etc.
To just get familiar with the hardward and setting up a miningpool just buy the cheapest antminer usb you can get.
Its the same way, so when you do decide to dive into a TH`s itd be a similar process.
If his primary goal is to learn about the specifics of the hardware and the processes involved in mining cryptocurrency, then a cheap antminer usb is the way to go. But remember his only additional step beyond configuring his mining software that such hardware needs is literally the act of plugging a USB peripheral in, which leaves me asking 'why bother' to begin with - just learn how to use mining software.
If his primary goal is to make accumulate cryptocurrency, then his absolute best bet is to forget all about mining and the lure of imaginary 'cheap money', head to an exchange, and start buying on the dips.