BRS behavioral is pretty good and readable in a day or 2. General guideline with those is think about what is the most politically correct response. My rule of thumb was that you pick the response that would piss off the fewest people, not the one that an actual doctor would do.
Quick things to remember, nothing is 100% definite:
1. Never consult
2. Always ask more questions
3. Cheapest test is probably the first one you should do
4. Privacy is sacrosanct unless they are a danger to self or others
5. Same goes for autonomy, unless they are deemed incompetent (which is a legal issue). Drunk people are considered temporarily more or less "incompetent" to make their own decisions.