You can apply for the one-year PR card soon after arrival, yes. But like any bureaucratic process involving IRCC, no, it is not immediate, not like going into a Service Ontario centre and obtaining an Ontario drivers license upon surrendering a drivers license from a jurisdiction which Ontario recognizes.
It will take time. I do not know the processing time for such applications.
Yes, this and other similar forums are indeed a good place to share information, experience, and insight, even to vent some, and can thus be very helpful.
Declarative advice, however, is inherently suspect. There are obvious exceptions, like advice which amounts to simply restating a well-known, fixed rule, like the advice to meet the PR Residency Obligation before applying to renew a PR card. But any advice which is in any way an opinion, or dependent on the particular facts and circumstances, is inherently suspect; indeed, again with some exceptions, better to generally mistrust posts made by those who offer declarative advice.
There is a reason why communications with lawyers are strictly confidential: so that those seeking advice can fully divulge all potentially relevant information (not just what the client thinks is relevant, but all potentially pertinent information), so that the lawyer can better assess the situation and offer advice. That is the least an experienced lawyer needs, the least, to offer any advice approaching a reliable opinion (and which is why free consultations are inherently general information not personal advice, except, again, as to simple, obvious matters, like you need 730 days in Canada to be in compliance with the PR RO). Even then, the opinion one obtains from a lawyer tends to be rife with caveats, contingencies, qualifications, and probabilities, unless again it is a matter of applying a simple, well-known and fixed rule. A venue like this forum does not facilitate the exchange of anywhere near enough information to so much as approximate the lawyer-client interaction.
Of course most prefer simple answers, straight-forward declarative instruction or advice.
But the reality is that there are way too many nuances, potential pitfalls, caveats and exceptions, all subject to the particular details of the individual's specific facts and circumstances, to rely on simple, declarative advice offered in a forum like this -- so much so, again any such advice is inherently suspect and, frankly, so is the source of any such advice.