Before you give your heart to a Newfoundland, keep in mind that there are drawbacks to this breed. Newfs shed--not just a little, but a lot, all the time, with an extra heavy shed in spring (called "blowing coat"). Newfs also require a lot of grooming to keep the coat from getting matted and unsightly. Even washing a Newf is difficult because the water repellent coat requires lots of shampoo and lots of rinsing.
And Newfoundlands drool. Picture a dog with a long string of drool hanging from either side of his jowls, who then shakes--drool is slung onto the walls, the ceiling, and anyone standing nearby. If this makes you want to retch rather than laugh, you might want to consider a different breed.
Newfs also need a lot of attention from people. They need to feel part of the family, which means having a giant dog inside the house most of the time. It's not hard to love a Newf, and they're the best dogs in the world to hug, but if you can't spend generous quality time with your dog every day you might want to think about a more independent breed.
You also need to evaluate whether you're physically strong enough to deal with such a large dog. Your dog won't mean to tow you along like a kite on the end of his leash as he chases a squirrel, and he certainly will never intentionally knock you down, but young dogs in particular don't know their own strength. A rambunctious ninety-pound puppy can easily send you flying.