The most common problem *most* people encounter when attempting their first novel project is failing to realize that even a short novel is a f***ing long endeavor.
Too many writers rush in and try to get to the good stuff too quickly. Now, I'm not saying you shouldn't have interesting things happening from the beginning, but don't go and blow it all in the opening sentences.
Writing a novel is like dating. If you want it to be a "proper" one, you've got to take it slow. No kissing on the first date and definitely no getting naked while you're still on the dance floor.
Now, some will take this analogy and say that "quickies" can be fun too. But most of us aren't writing pamphlets. (Mokele's standing behind me with murder in his eyes... isn't he?

) Seriously though, I'm not talking about length (great books come in all sizes)... I'm talking about pacing.
So here's another analogy: Dinner. A wonderful experience... but not if it's just food and eating. Dinners are fun because of the friendships, the conversation, the laughter (and maybe tears), the atmosphere of the restaurant... If it was just a serving of food, then it wouldn't be any fun at all.
Sure, the purpose of the event is nourishment. But it's not fun until you throw in all the things that are outside of that "plot". The stuff that some people would call "unimportant fluff" is the very stuff that makes it all worthwhile. Otherwise we just stuff our faces and leave. Not a memorable event.
Same with a novel... let your reader be seated at the table and enjoy the spirit of the story as it unfolds... don't just shove food (plot) in their face and say, "Eat it... it's good."
Take your time and ease into your story. Make it interesting, capture your readers attention, but remember that you have a truckload of word count to actually get it told, so there's no hurry.