Hi, and thank you for coming here with your question.
It sounds like you are in a really tough situation -- dealing with kids who can be difficult on top of already having a drinking problem.
On top of all of that it sounds like you are becoming depressed.
Your question was that you do not know where to start.
The best place to start - from what I understand about your situation - is to find a 12 step program (like alcoholics anonymous) and start attending daily meetings.
Even if you are still drinking at the beginning you can attend the meetings.
With time you may be able to start finding better things to do with your time.
For example, have you received a degree of any type in school? If not then maybe you can look into getting one online. It will be good to exercise your mind.
Another idea to do with this would be to see a psychologist so that s/he can find out all about you and give better suggestions than someone who doesn't know you personally.
I see we have run out of chat time, but we can continue this as a question/answer.