Scary proposition. Nothing in life is free. But if this were a legitimate check then I would give away as much as I could- 50% right away to the Catholic Church, for a modest attempt to repay God’s lifetime of gifts to me, then take care of my kids and my granddaughter, pay off all my debt, buy a modest house and car, hire a secretary to transcribe my writings and get them ready for publication. Then start giving it away to worthy charities.
But again, nothing in life is free, nor should it be. So this is a writing prompt which has no realistic relevance.