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I feel pretty overwhelmed by the amount of information/tools I need to scan to realize what I can do there.

It might be worth considering some kind of instructive overlay which ends in the proposal editor you've created.

Edit: But I am really no UX expert; just what I've thought..

Agree with this. Some sort of wizard or interactive product tour to hand hold me through the aha moment described by another commenter might be quite helpful for the onboarding experience.

You could use something like this to assist with that: http://github.hubspot.com/shepherd/docs/welcome/

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