In short no. They arn't a recognised brand. Stick to Burton, thirty-two or similar
NO The Dredge boots are not snowboarding boots. They are casual snow boots with features that are used in certain snowboarding boots but are not meant to strap into bindings.
No
skis, poles, ski boots
Snow pants, hat, gloves, boots, coat
pretty much just the snowboard, boots, and bindings. And if needed a helmet, definitely gloves!
You can get good deals from online dealers and stores such as Amazon and eBay but you can also find other online stores that specialize in selling snowboarding boots, clothing, gears, and other outdoor activities gears. In Amazon, items are usually offered in discounted prices. In eBay, items are usually second hand that's why prices are also lower compared to the original price.
You can get some really cheap equipment on Ebay for snowboardings (or anything for that matter).
They are roughly the same size. It's really more dependent on your shoe size and what type of boot you get. Ski boots are harder (and, in my opinion, less comfortable), whereas snowboarding boots look and feel more like normal boots.
Your basic snowboarder has Board, Bindings, Boots, Gloves, Goggles, Helmet/beanie. As well as Jacket and Pants that are designed for snowboarding. Most of these are commonly available either at snow fields or nearby.
There are a few good websites which offer forums dedicated to snowboarding. A few of these are the SnowboardingForum website, and the ABC-Of-Snowboarding website.
Because you can do wicked tricks
Hayden Nester is the best.