Here are some specific questions I have:1) Are there any particular sub-markets within Orlando that are well-suited for small multi-family investment opportunities?

Make sure you know what you're buying. 

They cannot file an eviction suit before they give this notice in writing.

Enter into an option contract to buy your replacement property4.

And I don’t have mortgage so I didn’t buy insurance. 2) hoa, tell me is upstair radiator who cause the leak and I should talk to upstair owner to have him fix that.Upstair owner told me that the leak of their radiator is caused because building pumped too much heat.

Mortgage broker- I’ve been working with this broker since I started getting serious about buying my first house hack 7 months ago.

Whether you’re looking for a single-family home or a condo, there are plenty of options to suit your needs.

BiggerPockets also has a calculator you can use to analyze deals and I highly recommend you start this as soon as possible, even if you are not ready to buy.

We're great at finding deceased owners, and working with the Heirs to name a Personal Rep, and ultimately buying their property. 

So, I would study whatever complimentary avenues of study that you think best suit you.