Help constructing a seller financed deal to an indifferent seller

[Josh Thomas]

ARV is $270k. Needs $10k repairs.
Currently rents for $1,950. Tenant is moving out next month.

FSBO indicated he would be happy with the ARV as a sales price on an all cash offer. 

He owns property free and clear and is open to seller financing, however would NOT disclose over the phone the lowest amount he would accept down, per month, or length of term.

Are there magic words I can use to get more details out of him before I present an offer in person? Each time I pressed him for terms sales price or payment numbers he says "I don't know, I've never done this before".

Since he is indifferent, how should I approach constructing an offer? My first plan is to offer $260k sales price, $2k zero interest payments with nothing down and pay for closing. If he brings it up I would agree to a 5 year balloon. Thus he will continue to receive payments even more than before and would pocket ~$25k more than if he sold with a Realtor. If he wants more down I would offer advanced payments.

My exit strategy is to turn around and lease option the property to cash him (and me) out in 2-5 years for a $30-50k profit between down payment, higher rent and option price.

Does this sound like a good starting place to anyone?