Welcome to the Forum.
The camino Portugues is lovely, you will enjoy it. The question of preparation is a very personal one, some people prepare for ages some hardly at all, the best advice I read before my first camino was: 'Don't walk the camino before the camino!'
There is lots of advice here about the various route possibilities, whilst there are not as many Albergues as on the Frances there are certainly enough, and they are well equiped in Portugal, Albergues in Galicia usually have a lack of equipment in the kitchens!
Bom caminho!
Sue