My plan to stay sober is... just that. To stay sober.
Everyone is different on this, but I've been sober five months now by wanting to be sober and believing in my own ability to stay sober. All I've needed to do is 100% believe that I will NEVER drink again and I will NEVER change my mind, and it's taken all worry and concern away from me. Using that 'never' word has been totally liberating, really.
I find that the problem with elaborate plans is that I very rarely stick to them. I'm useless like that. I just need the absolute determination that I can do it and I will do it
Find what works for you. Have a look at AA, AVRT, Rational Recovery, SMART, and more. There's much information on all of these on this board. I use AVRT because it's simple and works for me, but others swear by AA. You just need to shop around and find the best fit.
Wishing you all the best.