Colera is quite empty, while Llança is a small town with restaurants and all facilities so you can have lunch there. Some tips:
- take sun protection, even in winter. Hats are good for your head.
- take water with you
- double check the trains; stations are small and not all trains stop there. It's about one hour away north of Girona.
This is the link for local trains:
In wikiloc you find the gps of the route:
You can install wikiloc on your mobile and it makes it very easy to follow the track. You have to buy the app but I believe it is worth.