The most important thing you need to figure out when you pick up a new kalimba is: "where is the One?" By the "1", I mean the root of the scale, the key of the kalimba, the note that you consider "home base", and probably the most important note on the kalimba.
(To complicate matters, there are usually multiple correct choices for which note you want to be the root - for example, you choose one note to be the root, and you are in G minor - you choose a different root note, and even though all the notes are exactly the same, you are in Bb major. We will ignore all of those alternative understandings for now.)
What you learn about the root note is probably applicable to every kalimba you will ever pick up, so it is worth understanding - or if you know about this already, it is worth learning more.