This question came after reading multiple will creating firms suggesting to formally name descendants who are being left out.
With two exceptions that I know of, there is no right to inherit. One of those exceptions applies only in Louisiana, and the other applies to surviving spouses. That said, it is a common practice to list all of one's heirs-at-law in one's will and, if any of those heirs will not receive anything, to say that the omission is intentional. While it is a common practice, it is, IMO, generally unnecessary.
Would a local probate lawyer (not from Florida) know enough to tell us if the will is legit (at least initially), or should we remotely work with a probate lawyer in Florida?
Legit? Pretty much any lawyer can look up the formalities for executing a will and tell you if they've apparently been met, and pretty much any attorney can interpret what a will says. However, if there are genuine issues, you'll need someone admitted in Florida.
We you say "courier service", I assume you are not talking about FedEx? Is there a common courier service for legal documentation you can suggest?
What I actually meant is what we call an "attorney service." They're essentially couriers that cater primarily to law firms and handle filings (in those places where electronic filing has not become the norm) and service of process and obtaining documents from court files. But yeah, not something like Fedex.