You can work when you obtain an employment authorization document. Ninety days to to obtain, provided the applicant does not make mistakes with the filing. Mistakes delay everything and avoiding mistakes is a good reason to hire an expert.
Ask the school whether you need a visa. Different classes, different schools, have different requirements.
My clients in your situation usually get their work permit around 90 days. Are you currently in status? If you are not currently in status and plan to remain in status, you should have an attorney prepare your applications for you. If they are not done correctly you could be placed in removal proceedings and that would be a huge headache. Your change of status if it is to something like a B-2 or F-1, will likely be denied with a pending adjustment case.
I would advise you to speak with an attorney before you file anything.
Andre Olivie, Esq.
Legal disclaimer: This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. Do not rely on this advice without speaking to an immigration attorney in detail about your case. This message does not create an attorney-client relationship.
around 90 days.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship.