How can an International student work as a nurse in the US?

Hi, I am currently a BSN nursing student (junior year) studying in the US with a F1 (student) visa. I am clueless about how I can stay and work in the US after I graduate. All I know is that I have to pass the NCLEX and start applying for a green card. So here are some questions that I have in mind:

Can I work right away after graduation?
What is the first step that I need to take/ apply?
When should I apply for a Practical Training? How does it work?
What comes after Practical Training? Is it H1B visa?
When can I apply for a green card? How long is the process?

Please let me know ASAP
thank you , MedSurge