Albertinho, I agree. But to be honest, there is nothing wrong with research. Some paths my friend and I took were far safer because we knew where to go and the markers weren't good at some places.
Starting in Ponte de Lima you have not much choice. It is the waymarked path over the Alto da Portela grande mountain to Rubiães and then the route through the villages to Valença do Minho and so forth into Spain. The only alternative is follow the motorway or the national route but this is not a good idea.
I do not know how big your group will be but a tip is to start one stage before Ponte de Lima at Casa Fernanda in Vitorino de Piães. The best caminho experience on the entire caminho Português. Casa Fernanda is a private albergue, donative. They offer you a bed, diner with wine, and a breakfast. They have 10 beds in a gardenhouse and 3 double bed rooms , two in there house and one in the gardenhouse. I have been hospitaleiro there several times.
Reservations are to be advised -telephonenr is +351 914 589 521. Fernanda speaks english.
I do not know where you come from once arriving in Portugal and how to get in Ponte de Lima but if you come from Porto there is a commuter train connection from Porto to Viana de Castelo . Leave the train at the station of Barroselas (NOT Barcelos !!!) which is one stop from Viana do Castelo.
From there you go direction Balugães -about 3kms- and from there are the yellow waymarkers to Fernanda (about 5 kms) A good warming up !
From Fernanda to Ponte de Lima is 14 kms.
The next day after Pone de Lima you will climb up the La Bruja mountain and the Alto da Portelo Grande , 20 kms to Rubiães , a tough day so warming up the day before could be a better beginning. Just a tip !