Having your sister involved is a great idea/motivation. I had multiple failed attempts to quit, but the time it really clicked was when I just had a sit-down with my now-ex and knew I would need to be accountable to her in addition to myself.
This site also played a very vital role in the early stages, because you see and read about so many situations and know that others are going through the same thing. I don't visit here often these days - I am happy to say I reached four years sober this past Saturday - but in those first 6-12 months, it really was a needed support group. Even if I wasn't posting, I was reading daily.
This is a strong plan, and I wish you the best. Just remember that things you can't control can sometimes throw a wrench in the best laid plans. However, one thing you ALWAYS control is whether or not you let those unexpected wrenches steer you to drink. Stick with it, and the future is bright!