If your LLC are single member disregarded entity, they don't file any tax return as they are directly entered in your personal tax return.

I just signed up here in BP and wrote that post late into the night when entering my properties and didn't quite grok it was going to create this post otherwise would've invested more in the writing. 

Multiply that by the complexity of each investor's individual circumstance and you get an infinite number of optimal strategies. 

Each of these variables will dramatically change the advice I give the individual asking me this question.

For example, I was approached recently(has happened many times) by an individual wanting to sell a property.

For most individuals that have high paying careers, property sourcing and management is not the best use of your time.

Later on you can invest in individual notes. 

I pursued my real estate license knowing that my end goal was to invest and to learn more about real estate in all aspects (wholesaling, flipping, rental properties, etc).I would really love to link up with an investor that would like to share their knowledge/partner with me as my goal for 2019 is to enter into the world of real estate investing! 

I hear a lot of individual state that they have investors help fund the project.

So most people would likely not enter into an agreement until you are 18, unless you have a co-signer.