Right now I have a good idea of the setting, because it's interesting to me, and it could be a good backdrop to the events, and even act as an antagonistic force if the story called for that. There's a basic premise involving the main character's father, who dies, and the MC blames himself for it. Now, that seems too simple and I'm getting ideas for how to make that death even more of a catalyst for major changes that happen later.

I'm leaning towards a sort of "redemption/forgiveness" storyline but also a "personal growth/adventure" storyline. Now, I'm trying to combine both!

To do that I think about what was so special about the boy's father, and what does the boy have to do with any of this later on? Who's story is this?

This is my attempt at an adventure/coming of age story, but with hopefully a lot more character depth than your typical young person's film. I'm fine with the polar good vs bad, so long as it's interesting, but I haven't gotten a bead on the antagonism of the story yet so I'm still keeping my options open.

Basically, I'm getting all these great ideas and I'm starting to pick and choose, and really hold on to a few of them. Should I be taking longer than 5 days to brainstorm? What questions should I be asking to develop the antagonistic forces?

I know of no writer who can write, perfectly, in the first draft. My suggestion is to start writing your story in whichever format is most comfortable to you, and should you decide to switch, make the needed technical changes during your rewrite.

Release the idea that you're writing in stone. Fear of starting is a form of writer's block. By convincing yourself that you have to plan everything out ahead of time, your fears gain legitimacy in your mind. It's just a little trick your mind plays on you to keep you from trying... because if you don't start, you won't finish, and you won't fail, and that's really the core of most writer's block -- fear of failing.

Remember, a story is only words, and words are easily rewritten. You can ALWAYS choose again. Give yourself permission to start, even if you don't know quite where you're going or what form your final draft will be done in. You can always make changes. That's what the editing phase is for.

I'll go so far as to say that if the first roadblock is beginning to write, then the second one is getting past the urge to rewrite the first three chapters endlessly.

Pat is right about the first two roadblocks. No matter how much you cringe at the first three chapters (I'm thinking of some hackneyed dialogue between my MC and his girl written last night), you'll get hung up if you don't power through them.