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PBS is a good approach when starting out and making/using your own figures. There are others which will disagree but you have to start somewhere.
PBS does not use the first call, only the second call and final call, at least as I learned it way back when. I'm an old Sartinista (read PIRCO member) and learned PBS and used some of the other tools (TPR) from that era. These preceded what became Energy! which does use all 3 calls.
I believe using PBS and making your own "figures" is a first step. It will give you an appreciation for the process and the raw data itself.
Moving onto using figures from other sources will always be the next step but a word of caution: do you know exactly how those figures are created?
Computing variants for all of the calls is something I can not speak to, perhaps others such as cj would give you some guidance.
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