The best way to estimate taxes on a property purchase is to go straight to the property appraiser's website (see below) and search for the property ("Record Search"), see the current year's taxes and assessed value, and then use the calculator at the bottom of the page to determine the likely taxes after a purchase (since they can change dramatically due to the effect of Save Our Homes).
And if you need information about how properties are assessed, and what exemptions are available, the property appraiser again would have the best information.
There is a lot of conflicting information out there... and while this year's taxes may be predictable, next year's depend on a lot of factors. You'll want to take future taxes into consideration, not just this year's.
Generally, on any property you purchase, given roughly the same price, market value, and millage rate, your taxes are going to be about the same in future years, after the property has transferred to your ownership. So you probably don't need to focus too much on a specific property's current taxes, as much as you'd want to know the tax impact on your move in general terms, as in "how much will I be paying per month in property taxes"? Same thing goes for property insurance, although - that is where you can find radical differences in costs depending on location, age, construction, and windstorm mitigation features.