Hi, Erith and welcome to the forum.
I don't know if you've seen the guide made by forum members on the Lisbon to Porto stretch, but I think it's pretty good (if a bit outdated).
https://www.caminodesantiago.me/community/resources/camino-portugués-lisbon-porto-2017.517/
Also some info on making shorter stages.
https://www.caminodesantiago.me/community/resources/short-stages-from-lisbon-to-porto.133/
This recent thread from
@GuyA raises a lot of your questions and may help you.
https://www.caminodesantiago.me/com...ues-having-second-thoughts.50280/#post-548112
I personally recommend starting in Lisbon, right at the cathedral. The caminho takes you through the Alfama (ancient Moorish area), old port area with some beautiful buildings, through the river walk Expo area, and then along an old canal. It is not very industrial. There is industry, along the river a bit further north, but you will be near the train tracks and can if you want hop on a commuter train to pass it by.
Albergues are popping up. There is now one in Alpriate, 20 km from the Cathedral, a perfect first day's stop. The hospitaleros are members of the Lisbon caminho association and they can help you plan and deal with your concerns.
And just a couple of days ago, we got a report that there is a new albergue in Bemposta, and it looks very nice.
https://www.caminodesantiago.me/com...ergue-at-caminho-portugues.50397/#post-550137
There are many nice towns for spending some time, particularly Tomar with its very nice little downtown and its amazing castle/convent up on the hill. And Coimbra, an ancient university city, with late Romanesque cathedral, old university library, etc. And don´t miss the Roman ruins south of Coimbra, I believe there is now a place for pilgrims near there, around Coimbra.
Please let us know if you have specific questions, but all in all, I think. you will find that the pilgrim infrastructure on this route is now very good. Add to that the great food and relentless hospitality of the Portuguese people and you have all the makings for a great camino. Bom caminho, Laurie