There are a lot of resources regarding seller financing and they discuss the advantages/disadvantages. 

What I'm trying to figure out is if there are any tax *disadvantages* for becoming a realtor if you already own a bunch of rental property?

Being that this is my first deal I am looking into working with a company that provides turnkey investments to go through the process of closing a deal with minimal risk.What are some of the advantages and disadvantages of turnkey investments and what are they typical returns once should expect from this type of investment?

Every buyer has different attributes that are advantages and disadvantages. 

Every niche has its own advantages and disadvantages. 

There are multiple ways things could be done, each with their advantages and disadvantage.

Pros and cons, advantages and disadvantages. 

Advantages and disadvantages?

When you do your lease file audit during the DD period you will find what is off and if it's not too bad I move forward even if they want to be difficult and not credit me the difference that I find.Being new to this you don't know what is acceptable which puts you at a disadvantage.

Return of capital is a disadvantage to the investor due to reducing their principal balance, in turn reducing the amount they are owed in preferred return and making it far easier to hit waterfall hurdles.