I've got an idea for a startup which I think many people would find useful.
I've gone through the following steps:
1) Other people (from different demographics) agree that this idea would be useful - some of them would even use it.
2) I have places to look for funding (tentatively interested parties).
3) I have a sketchy business plan (sketchy is in currently vague).
4) I have a basic process that the user would go through to use my product, and ballpark figures for costs and required elements for the idea.
I want to get this up and going soon, and I'd probably like a partner who could help with this (especially seeing as I'm in college, currently).
What's next?
It's the decision-making that moves the business forward - as you get used to that, the process of doing the work itself, meeting people, research, etc. will quickly become background elements of what actually happened that day. If you can't make a decision yet, then you need to gather more information. You're either doing one or the other.
An example list of tasks from your starting position would be:
-Research implementation strategies(self-built, outsourced, with co-founder)
-Evaluate early customer needs(example: are you selling a bells-and-whistles "experience," or will no-frills functionality be sufficient to solve customer problems?) and pick a core focus for product development.
-Plan style of external communications - which audiences will be addressed, how to maintain the best relationships over time
-Plan internal organizational structure over some time frame(how big, how quickly, what kind of culture, when do you exit)
-Establish motivations of all potential co-founders vs. self, and identify possible conflict points so they can be addressed early.