@Ken Chen what specifically do you need assistance with?

I'd recommend nothing shorter than 5 years.Regarding your specific questions:1) Yes, any competent closing agent (title company or attorney, depending on your state) can prepare the note and security instrument (security deed, mortgage, etc.) you need.2) See 1.

Specifically in FL you can only keep 25% of the interest with the remainder going to the tenant.

There are investors who like that they can do multiple draws and some features which are specific to HELOCs compared to a cash out refinance.

Best to have a month to month lease or one with a start and end date if you want them to leave on a specific date, that lets you move to eviction if they don't pay.

We need fewer regulations (or at least the correct ones) to incentivize housing construction and more up-zoning in appropriate areas to add density to existing lots.

His question was about areas to avoid, which was a little more specific than many similar posts asking about neighborhoods. 

Quote from @Heather Rummel: You can manage it on your own, but it takes a lot of work to educate yourself, particularly in the most heavily regulated corner of the world.I would start by calling around to property managers in the area for help.

The point to my comment is that when comparing equally a quality trainer and a quality forum IMHO the trainer will trump the forum.The knowledge base of the forum is so vast that without specific direction from a quality trainer an investor will be a little lost and may take the wrong direction to accomplish their personal goals.

Feel free to reach out if you need more specific information about your situation.