I have to disagree with this. For a horse that lives outside and doesn't show, do not clip. The whiskers and ear hair are there for a reason. Even on my show horse, I don't clip above the eyes. Bridle path is the only thing I would clip on this horse.
As far as shampooing and mane/tail maintenance goes, I prefer a low maintenance approach. I'll shampoo at the beginning and end of the warm season, and otherwise it is only as needed. I keep his mane pulled, but only rarely (once a month maybe) do anything with his tail. I use Mane and Tail shampoos and conditioners.
As far as grooming items that I use on a daily basis, I have a rubber curry comb, hard bristle brush, soft bristle brush, face brush, and hoof pick. I have many other grooming implements, but if you are new to horses I would start with that and acquire more items as you need them.