Somewhat new to circuitry stuff. What exact parts should I buy for the PCB?

I actually think that it is the opposite. The Terrarium doesn't have as many components which at least to me equals to a starter build.
The part count is relatively low, but there are some unique parts in the assembly like using headers to mount the Daisy pod above some parts on the board. Also challenging to put cutouts in an enclosure to plug the Daisy into a PC to program it. So even with a low parts count, a bit of prior experience with part selection, soldering, and drilling out an enclosure will make it much easier to assemble.
 
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