First thing you must do is graduate from college. It is almost impossible to get a GC without at least a Bachelor's Degree, unless you are willing to wait for ages. As for your questions, 1. You need to file for a) Labor Certification, b)I-140 b)I-485 and depending upon your need, a work permit. 2. The process may take anywhere from a year to ages. there are categories sperated for GC such as EB1, EB2, EB3, etc...EB1 being the fastest but requiring a PhD and/or substantial experience. applying after Bachelors without any experience would fall under EB2 Category, for which the wait time i think is around 3-4 years or maybe more. 3. Not Sure. You might be able to work under OPT for the first year after you graduate, but after that i am not sure. The best way would be to file for H1B first, which gives you a 3 year working visa, and then you can work on your GC process. 4. Yes. Hope that helped. i'm not a lawyer or an expert, but someone who is going thru the GC process myself, so i may have wrongly stated some of the facts.