2) It sounds like your colleagues are not fully invested in having your project be a success. Is your project something that everyone agrees the company needs? If not you may have to fall back on your manager to explain why it is needed, or re-evaluate whether you should be doing this.
If the project is something that everyone agrees the company needs, and colleagues are still giving you the cold shoulder, something is dysfunctional here. Maybe they have a low impression of your competence -- why is that? Was there a group decision to hire you, or were you parachuted in?
Whatever you do, do NOT stop asking questions. Don't even DELAY asking them, if you really can't get what you need from the code. You stop asking questions when they threaten you with broken bottles.
3) A mistake that people fresh out of college often make: stopping dead when they don't get the resources or attention they need. In the workplace, if the problem is elsewhere and "not your fault" you still have to take steps to fix it.