Honestly the best place is live in person with a company.  The NMLS testing doesn't really give you what you need to really originate,  How to really review items, prequal a borrower etc.   If the company you work for has a sales manager or similar- that is the best place-  I hire many new LO's and do the training myself as I want them to be confident in their abilities and being an LO is more than just selling a relationship or a product it is what to do with all that when you get a client.  There are classroom and on line classes but I don't feel they give you really what you need to be good in all area's.  I sit with them they sit with me on each and every new loan and understand all aspects.  My background is underwriting so it makes training easy!  Good Luck!