I was reading a few articles on this and it appears that prenuptial agreements only protect the assets you have before marriage, but anything you obtain after marriage would not be protected.
A prenuptial agreement can be written to protect whatever assets you like, as long as a judge doesn't declare it unconscionable and refuse to enforce it. I'm not a lawyer and have no idea whether judges ever do that, but I can see it being a possibility if a prenup is especially unfair.
But you don't need a prenup to protect gifts and inheritances you receive during the marriage. All you have to do is make sure you can prove the gift or inheritance was yours alone (have your mother make it clear that she is giving the money to you, not to you and your spouse) and then keep the gift or inheritance separate throughout the marriage. Don't deposit any of it into a joint account, don't use any of it to pay for a joint asset, and so on. Since the burden of proof will be on you to show an asset is separate rather than marital, you need to make it easy for a judge to see that you never intended to contribute any of that asset to the marital enterprise.
Florida is not a community-property state. You would be safer in a community-property state, where judges have to divide the marital property as equally as possible without taking into account the separate property of each spouse. In Florida and most other states, the judge has to divide the marital property as "equitably" as possible, and can look at the whole picture when deciding how to split the assets. They are supposed to avoid including separate property in the division of assets if they can, but there is often no absolute prohibition on their doing so.
Here's a link to a helpful article right here on lawyers.com, and here is a link to the Florida statute governing division of property in a divorce.