Info request: Canadian Resident purchasing used boat in Florida

[Clemroc]

Hello forums,

As per title, I am a permanent resident and will be looking to purchase a sailboat in Florida either this year or next year. Between my Canadian residency and French passport, I know I can stay (as a tourist) up to 90 days in the US without a need for visas or anything.
Also, important factor: I intend to leave the US with the sailboat soon after purchase (as soon as it's ocean-ready) to go cruise the Caribbean.

Thus, my questions are related to purchasing a used sailboat. Could anyone let me know what the "typical" steps are?
What paperwork needs to be done to leave US waters with the boat, if any?
Are there taxes for used boats?

Feel free to provide any other information you find relevant

Best regards,

Clemroc