WHat you are asking is in fact a lot, lot, lot of questions in one. And not related to PlayMaker, but to Unity itself.
There's questions about Physics, Physics Materials, Rigidbodies, ways to move rigidbodies (and there are many!), constraints of rigidbodies, and the build in character controller - in one question.
All of the above are fairly well documented in Unity standard Documentation, but it can be a wall to get past.
A way to get a head start AND using PlayMaker could be to purchase one of the pre-made platformers made with PlayMaker in the Asset store, and then look at all the details of how that is done.
You can also look into standard Unity demos and see how they are set up - again because your question(s) do not really relate to PlayMaker, but to how Unity is supposed to be helping making your game.. And there are MANY options as far as I can tell from where you stand now. M-A-N-Y details to know if you want to master making your own character controller.. which is what most people do, but there is Unity Info to learn first