Hi all I am a new groomer looking to purchase my first set of clippers and blades: 1) which do you think is the best brand of clipper? 2) if i buy a two-speed so that I can groom heavy coats can this also be used on dogs with lighter coats as well? 3) how many blades do you think I would need as a starter set? I was thinking so far from my grooming course maybe I would need a 4, 5, 4F, 5F, 7, 7F, 10 and 15 - what do you think?? thanks groomers!