Generally, you must invest at least $500,000 in an "at-risk" business enterprise in the US that will employ at least 10 US workers to obtain a green card. This would not, however, be "immediate."
There is nothing immediate with the US immigration. Capital from $500 000 to 1 M, lawyer and other professionals' charges depend on the project; might be as much as 50K or even more, it depends.
Start with the USCIS website.
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There is no such thing as immediate.
But, with $500,000 invested and approximately $50,000 in administrative fees, you should get one in about 1 year ... that is good for 2 years and can be renewed.
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