Visa screen certificate has nothing to do with actually obtaining a work/immigrant visa apart from stating you meet requirements. You need a employer to apply for work/immigrant visa and then it will depend which you have applied for and if immigrant when your PD is
H1b is now finished until April next year when employer can file and if approved you have to go through an interview and can not start work until Oct if passed interview. H1b requires a BSN as a minimum and the job must be advertised as a BSN. Exception is if the facility doesn't have a cap and that generally is university hospitals and not many jobs there for H1b. Immigrant visa will depend on your experience and what category you are in. Most nurses come under EB3 whcih has a wait of voer 6 years and you can not stay in the US and work whilst waiting to be processed
I dont know where you are from, but if you are a citizen of either Mexico or Canada, the Trade NAFTA work status is also an option. You need the Visascreen certificate (some border crossing officers will also accept the Credentials Evaluation Service), and a very detailed job offer letter. This is a non-immigration visa, so you may be asked to provide proof that you do not intend to immigrate. There is no need for immigration attorneys. There are no requirements as far as the employer needing to prove they tried to hire American nurses. It is not a sponsorship visa, which many employers are wary of. It costs 60$, directly at a port of entry. Basically, when you go through customs and they ask if you have anything to declare, you say you are asking for a TN status. They bring you aside, look at your paperwork, and if accepted, you get your papers right away.
Also, if you are wanting to get H1b, you might want to rethink it. Hospitals right now are doing very little if not NO sponsorships. Speak to a recruiter and they will pretty much hang up on you.
Think about it: Why spend tons of money on immigration attorneys and paperwork, along with all the time and the legal liability, to hire a foreign nurse with no US nursing experience when there are TONS of American nurses who would give their right arm for a good nursing job right now?