Unsure about Visa process

Hi,
I’m from Swakopmund, Namibia. I will be starting a Nursing Ausbildung in Hamburg on 1st October 2019. My visa appointment is next week and I am a bit unsure of a few documents as many people mention extra documents online.

My paperwork for the visa has already been completed. With my work contract(listing my detailed work aswell as what I will receive monthly), hostel room contract/agreement, valid passport, visa application, 2 passport pictures, previous visas,police clearance certificate, letter+ work contract and bank statements (from my father who will also be supporting me financially), language certificates and also my recognized school leaving qualifications + needed copies of all these documents. 

My travel insurance and flight ticket reservation will only be required after visa approval.

The only thing I am very unsure about is whether I need approval from the Bundesagentür für Arbeit or the federal employment agency beforehand or whether that is done during the visa process by the embassy?

As it is stated on a few websites that for a duales Ausbildung this is needed, though it does not state how or whether it should be done beforehand or whether the embassy handles it. I am also aware that my vocational training is on the positive list of  vocational professions and that would mean that I would not need this approval, though I’m quite unsure on the subject as different websites all have unclear answers. 

Can anyone offer me any guidance on this subject?