With regard to training, I would say, first you need to decide whether you want to do a long course (say one evening pw for an academic year) or a short course (say 2 days) at a private college. I have done both
Strangely I didn't really learn any more on the long course than I had already learnt on the short course, but everyone's experience of short courses differs greatly. Some are excellent, some are not.
With regard to the product range, there are many threads on here about this subject, and many of them say pretty much the same thing, so I would suggest you have a go at searching and see what you come up with.
However, my two pennys worth is that you should use a brand you believe in, so that you can be enthuiastic about it when promoting it to your clients. Aftercare advice for facials will normally, or at least often, include recommending products for a client to buy.