What makes it the best

I've been out of the country for some time and am looking to ghet into sales, as I believe the skill of selling is an important part of any business. I have though found ii hard to find information on who is who inn the sales environment. Key questions that I have are a)which companies have the best on goingtraining for the employees b) what level of qwualification you need to be considered for a position and lastly c) do they have a branch in Pretoria.

I thank you in advance for any and all comments.
Nolo