Seller Financing Deal

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I have a questions for y’all 

I recently found a deal with 7 houses and a duplex, he is doing seller financing at a 5% rate.

He is asking $260,000, with a $50,000 down payment, approximate value is $450,000 

There are repairs that are needed.

The problem is I recently bought a house at $450,000 so I cannot afford all the houses.

I have about a $10,000 down payment saved up.

Also are there any good strategies to ask him to split up the deal?

How would it work with seller financing? 

Would he check my income, liabilities, credit?