This planner is perfect. It is new this year, but I have used the Wise Pilgrim app and books on all of my Caminos.
https://www.wisepilgrim.com/en#camino-frances
This lets you plan your distance each day and pick out what kind of accommodation you prefer, as well as the budget. Most lodgings are on booking dot com, but some are reserved by email. To make it easy, just use booking dot com.
I much prefer staying in the smaller towns and not walking 20km per day. This planner lets me set my distance and find the towns that suit me. Somewhere between 10-15km per day is enough for me. This will also let you avoid some of the crowds that start out each day from the popular towns, like Melide, Portomarine, etc.
Many private albergues have private rooms too, which allows you to have more of a pilgrim experience, especially if they are doing a communal meal. You don't have to stay in a hotel to have a private room and bath.
With Jacotrans, I just sent a Whatsapp message each night to do a pick up and where to take it. They give you a tag to put on your bag, where you write your name and destination, phone #. I wear my back pack, with the hip belt and use a small sort of duffel bag for my transfers. A back pack is made to take the weight off of your shoulders, so once you put in some water, rain gear, some snacks, maybe a change of socks, first aid, a plain old pack would be dragging your shoulders down.
Not sure where you live, but see if there is an American Pilgrim group near by. They can help answer all your questions, give your pilgrim pass and usually a shell.
It all sounds a bit complicated at first, but once you start reading some of the Camino forums, it will take your confusion away.
