He isn't a motivated seller.If it will rent for $1900  a month, that means to make money you have to have a payment that includes, principal, interest, prop taxes, insurance, at less than $1400 a month. $190,000 at 3% interest is P&I $801 + prop tax plus insurance a month.

Now, you don't need hundreds, or even A hundred clients to achieve your goals.

I am assuming brrrr do similar but in reality, due to conservative nature of refi appraisals, I suspect they achieve less valuation if based on the refi appraisal.https://www.sandiegouniontribune.com/2024/12/16/home-flippin...

Locate a Motivated Seller that will consider Seller Financing.

I'll be happy to meet and talk with you and explore opportunities to help you achieve your goals.

The "online leads" trend becomes a vast pool of scams, each one discovering a new and "better" way to find motivated sellers via SEO/Paid adds/Social Media etc, and automatically aims to make a profit from selling those so-called leads.

Currently,I don't have any experience in RE investing but highly motivated to start it asap.

In return, they will be motivated to get a job and pay back every dime owed while lavishing you with praise.

Pretty much everything I have seen and read is:Find out the sellers motivation/problem and speak to solving that issue.Give an offer but explain how you got your numbers.Other than that, it seems pretty limited for negotiating information. 

From personal experience, this can motivate them to do a final deep clean before handing over the keys.Finally, for peace of mind, you might consider consulting a local real estate attorney.