What is good for a realtor is not necessarily good for a home buyer or investor.

On a $300K property, that means the person working his/her tail off to find the right place for a prospective buyer is going to make about $1500!

I currently don't extra money to invest for that reason, I focus to sell investment rental properties to investors and thru this I will learn and make money than I will start investing myself.I will be dealing with a lot of Foreign CASH buyers that overseas and they will be investing in Miami.

I'd leave it as-is and let the buyer repair it, or have it repaired yourself if it's in the budget.

Take the time to learn how to talk to people, solve problems, analyze a deal, network with investors and cash buyers in your area.

The buyer had 10-14 days to inspect the property with a guarantee of 100% refund pursuant to Florida RE law. 

Usually go with non refundable down payment,  some type of monthly credit towards their purchase (only if negotiated ), buyer responsible for all repairs ( assuming home is in good condition when they are buying it) and if they are not able to execute at the end of the lease term offer an extension period with possibly a little more down payment. 

It's great to be a listing agent, the buyers agents do the bulk of the work.

As a first time investment buyer, I just don’t know which is the better investment.

They tend to be a bit stricter from what I understand, so some sellers might be less inclined to work with a VA buyer also.