Welcome to SR, Martin. I am glad you are here with us. I have managed to stay sober for 2 1/2 years now, using SR as my primary source of support. Most people need more than that. (AA, SMART, AVRT, Inpatient, etc.)
I spent a LOT of time here at SR, especially in the first few months of sobriety. I posted occasionally, read a lot, and gain a great deal of support from the good people here.
You need to find a plan that works for you. Without a plan, your chances of success are reduced.
As to who you tell that you are trying to stay sober, I told virtually no one. If I found myself in a social situation where I was expected to drink, I simply made up an excuse for not drinking on that occasion. And did the same thing the next time. People don't really care, in my experience, if you choose not to drink.
Good luck. I hope you will post often and let us know how you are doing.