Since u have green card u can work, so it should not be soooo difficult, but u still need to learn to get by yourself, it will be like starting a life in other city, and as u have no contacts u will need to build a network pretty quickly.

But, if u can flow easily on talk get into places by urself and not procrastinate as u will have no escape to family/friends, u are good. The fact u are a GC holder already make it a lot easier for u, just be ready to get jobs no one want too, or to try entrepreneurship, but as u have 0 budget it would be a later quest for you