Well, there's all kinds of information on the web about how to get a licence in Colorado... research that - but you're going to have to research getting a green card as well I should think... You'll need some sort of work permit... and the question becomes do you want to obtain US citizenship? Personally, I'm looking to move the other way! Do a LOT of research so that you know you're going to be happy wherever you land... You might head to a place where growing is legal but everything else sucks.... And what is happening to the cannabis industry here in the US is that the large mega-corporations are getting in and lobbying for rules and regulations that rather squeeze out the little guy - unless all you want to do is grow your own...
Good luck... there's a LOT to think about!