Where can I learn more about seller financing?

[Facundo Gauna]

Hello there,

I am reading the multi-family millionaire. And, I have read other basic books. I also listen to some of the BP podcasts and occasionally I hear praises about seller financing. 
I found a really interesting listing where the seller is open to seller financing.

I qualify for a conventional loan easily, but with the higher rates and 20-25% down, it kills my returns, so seller financing at maybe 5-10% down, I could have a good return with appreciation.

From what I gathered, 

- I would need to hire a real estate attorney to be able to close the deal. The seller would also have to hire an attorney.
- As long as I can sell myself to the seller, I could be an appealing option since I have strong job stability and financials. The seller would probably be a retired investor who doesn't have the energy or desire to continue managing the property and want to collect a paycheck. 

So my questions are,
- Where can I learn more deeply about this? Any books or podcast recommendations would be appreciated.
- What's a good offer?
- Assuming I am working with a retired investor, what happens if the seller perishes? Does the note get passed down to the family?
- From forbes.com, it sounds like they typically have balloon payments. Does it always have to be the case? Can it just be a 30-year loan?
- If at some point I want to refinance to a lower interest rate, I could do that freely, correct?  As long as the loan principal is paid in full?

Thanks ahead of time! 🙏
Have a great weekend.