Finally, 5 days after I started this process they had a sales guy call me and try to retain me.

It's free for me, the only fee is for my tenants when processing payments. 

I just came across a video on youtube called How to structure you real estate flipping business with Toby Mathis. 

I realize there's no way to capture everything, and learning is a continual process, but it feels helpful to me to have a working "cheat sheet" of information to study and reinforce important concepts.

I've been wondering if I should become a real estate agent and start the process of getting my license at 18?

only if it doesn't work ha    Lots of great feedback and advice here all comes down to your values and after that your goals work on those first to slow your process down and really get clarity on what you are actually trying to accomplish.   

Who has the best terms and who processes quickly, my neighbor is selling soon and I want to pick it up before it hits the MLS.  

Finally, I would get started on the FHA/VA certification process early.

what is your biggest idea/picture for backyard with sloping structure with budget consideration in mind ?

Perhaps emphasizing the stability and long-term growth potential of seller financing, alongside the flexibility it offers in structuring deals, could help sway his decision.