If you're already familiar with Unity itself, it's probably better to start with 2dtk. Just have a look at what it does, how to use the components, how to create a fitting atlas pipeline etc. This should only take a few hours and you should probably not do any of the coding tutorials, though simply watching them can never hurt. After you know the limits and purposes of 2dtk you can use PlayMaker to see how to actually use it. By then, most action names should be self explanatory, so you'll face less of a learning curve. However, if you are new to programming or Unity, then be prepared to spend weeks picking up PlayMaker. It is hard to teach the logic required to use it and while it is most certainly easier to pick up than programming, it's no walk in the park either.
This is my personal opinion, maybe there are some arguments against starting this way, I don't know. I hope it helps anyways