Oh cool, I went to school with their (late) daughter, Katie and they were at one point my friend's landlord.

Should I attend a physical real estate school or should I take online classes?

You could get a real estate license if you have little money or if you do get a job right out of school you could buy a property that allows you to rent out space (either a separate unit or bedroom(s) )  AKA House Hacking.  

Tenants don't usually move around much during the school year and the holidays if they have kids.

You might get your real estate license and sell part time while you are in school, it is a great way to get started in the business.

I'm located in Jacksonville, FLA and I was wondering if anyone could recommend good schools or advice.

I don't think it is like grade school, it is more like Dad (Sr), Son (Jr), grandson (the 3rd), ...

The location (schools, restaurants, crime, etc) is decent but nothing too promising in terms of appreciation (3% annual average) Here are the details: Purchase price: $170,000Rental Estimate per month: $1500HOA: $1000/yrInsurance: $1100/yrTax rate: ~3.4%I assumed the following:I use a 20% downpayment on a 30 year fixed conventional loan w/ 4% APRNew build so warranty is covering most things so minor, if any, maintenance will be neededTake into account 1 month of vacancy per yearTake into account annual broker fee to list of one months rent~5K closing costs~2k in appliance purchasesResult: Assuming rent range of $1500-$1550/month and assuming 1 year I wont have to pay the broker fee to list:From my cash flow analysis I am projecting to have positive cash flow of around .02%-2.1% per year. 

Buying a rental property during medical school?

We inherited a tenant who is month to month, but actually has 4 people in their unit as well (Mom and 3 Junior High/High School age kids).