That is a big part of the journey that each and every individual Muslim must take, which is to do his very best to follow Allah's way.
Each and every group will (naturally) label itself as the most correct way of doing things, and only Allah knows which one of them really is 100% on the right path. So basically no one can tell you what the real righteous path is. It's up to you, and to each individual Muslim, to choose their own path. See this hadith:
Hudhaifah narrated that the Messenger of Allah said:
"Do not let yourselves be 'yes-men', saying: 'If the people are good
then we will be good, and if they are wrong then we will be
wrong.'Rather, make up your own minds, if the people are good then you
are good, and if they are evil, then do not behave unjustly." (Hasan)
So it's clear from the above command and that you're not supposed to go out and find a group and just follow them. Learn Islam to the best of your ability, read and listen to what various scholars say, and then follow the path that looks like the right one. Yes, you may err. None of us are perfect and we are all sinners. All that we can do is do our best, and to repent once we learn that what we did was wrong.