With fast development,how can i cater to the changeable demands for customers...Am planning do my own business in electronics

There are too many thing confuse me . How to search a reliable goods supplier, how to do market position....The all seems an imppossible commission for me...one of my friend told me their company set up a new sales model is different from traditional r commerce...am think about join them...should any one have more ideas about it? Thank you advance...