(Before I start, I am in retail, so my answer comes from that perspective).
Success comes from all the usual - good business model, great product, strong business foundation, working capital, etc. But, the one thing that is hard to control is "buzz". You of course must do all the obvious things as listed above, things you probably know, but getting a product noticed in a crowded marketplace is virtually impossible.

Of course, everything depends on your goals and what you want to make of this business - do you want a 500K business, or a 500M business. But, if you can separate your product from the rest by having a real edge, something very different and marketable (not just that you think it is, or people around you who like you tell you it is), or you can connect with another company or individual or celebrity who can give you a leg up.

Other than that, hard work, integrity and building a team of great people, and then applying liberal amounts of patience, will give you the best chance of long term success.