Timeline for international student in Final year of Nursing School

I will be starting my final year of Nursing School this fall.YEA!

I'm working as a nurse extern starting next week(CPT). YEA!

I know I have to apply for OPT sometime in January 2007. Besides the OPT before I graduate in may '07, what else do I have do and when?

Can someone pls explain VisaScreen to me and what I have to do, when?

As an international student do I have to do anything different (from my fellow classmates) before I write the the NCLEX?

I plan to ask the hospital where I am doing my externship this summer about sponsorship for GC. What exactly does the hospital have to do? I want to keep it simple for them, so I need to know exactly what I am going to ask them to do in terms of GC?

tks