Tax Lien Question for unpaid taxes

[Wryland Reed]

What is the process for a property getting unpaid taxes sold to public bid in Miami Dade County?

If I found a property that has not paid their taxes for a year or two, what is the exact process for paying the taxes and placing a lien on the property?

I can call the Miami-Dade County tax collector's office and find homes that have not paid their taxes... how long is it before I can pay the taxes and place a lien on the property for that amount? Or what is the length of time I have to wait before it is offered at public auction and can I only wait until that time?

Please respond if you have purchased tax liens or if you have an example from your county or especially Miami-Dade.