I think you have a great attitude for what you need. To be outdoors, breath, walk and hopefully meet some really nice people. I know there are well meaning people who have responded who have no experience as a pilgrim. I read what they write and I know what they say today may be so, so, different from what they will say when they have reached Santiago. People who have walked many caminos who have responded all have a similar theme which you have already embraced. Just walk and be free. I will not even begin to project as to what is in your mind, what you need to ponder, or release from your mind or body or spirit.
Some practical advice.
Use Gronze.com This free website has lots of great information. If you can't speak Spanish I am sure you know you can translate it to your language in Google Chrome. It has distances, elevations, places to sleep and reviews. You can also download the apps Buen Camino and
Wise Pilgrim. They have lots of information too as well as GPS tracking. Which you probably will not need especially if you walk the
Camino Frances.
Yes you need a credential or Pilgrim Passport to stay in municipal albergues or donativos. It is important to know that neither type of albergue, municipal/donativo accepts reservations. They are all first come/first serve. Donativos are usually very simple accommodations, often but not always run by religious institutions. (remember none will try to force their beliefs on you). They are wonderful places to stay and often will have communal dinners so you can share meals with other pilgrims. These dinners can be some of your best memories. Donativos are not free they are by donation. I do not know your budget but please leave something if you can. If you are really tight on money donativos are there to help those pilgrims who are really in financial need. here is an example of one of the most famous and beloved donativos on any camino route:
Información del albergue de peregrinos Albergue La Cabaña del Abuelo Peuto, en Güemes: Precio, plazas, características, etc...
www.gronze.com
The donativos are listed with a D and are easily found on Gronze.com
Also if you are on a tight budget you can look for albergues that have kitchens. A kitchen that has everything, plates, silverware, refrigerator, stove etc will say full use in Gronze. Otherwise it will tell you what they have. But remember in Galicia at the Xunta (name of the municipal albergues in Galicia) they have big beautiful kitchens but you can't use them. Why I don't know.
Municipal albergues are less expensive than private albergues. Many are really nice. You will almost always have a great resource if you have questions about where you are going the next day or where to buy food or weather or anything from the people who are running the albergues.
Be sure to bring snacks and have food for lunch. There will almost always be a place to buy food where you are sleeping.
When you arrive in an albergue shower and wash you clothes as it may be crowded and you want some hot water and a place to hang your clothes. Where really light clothes that are quick dry. There are lots of packing list videos on You Tube and here on the forum. Light clothes and light as possible backpack. Wear trail runners if you can. No break in and boots are heavier and you will sweat more and you need to wear them alot before you walk. You come from a cold weather country so you will probably be fine with a light sleep sack. Most albergues do not have sheets. Have a quick dry towel also. Wear a wide brim hat and have sunscreen. It is hot in Spain. If you do not have or can find the gear you need in Kyiv I would recommend starting in Pamplona if you are going to do the
Camino Frances so you can go to Caminoteca or to Decathlon to buy necessary items
As many have said I do believe every one of the posters who have walked on many caminos have said, me included you really do not need to plan. Yes it is crazy the first few days NOW in St Jean. But that can change . If you have not already done this, use whatsapp to write to contact the albergues to see if they have a bed for the day you would want to start. Also you need to go to the in to the Municipal in Roncesvalles to get a bed on the second day.
alberguederoncesvalles.com
If they say they are sold out then leave early from St, Jean. They will have beds for people who do not reserve ahead of time. But I have read by 2 or 230PM those beds are gone. So go early. It is a long and hard day.
Finally my only walking advice is listen to your body not your head. Your body will tell you when to walk, when to rest and when to eat. If you have walked 20 kilometers for example, and you feel pretty good, but the next albergue is 6 kilometers I would say stay where you are. Those last 6 kilometers could end up being harder than the first 20. Finally find your walking rhythm. Stay with that rhythm. Your body will thank you and you will tire less easily. Just go.
Remember you own your feelings and what you are willing to talk about or keep private. It is not rude at all to tell someone what you will and will not discuss. I would not dare project what you have experienced but I am sure you will be fine. You are young, strong and resourceful. Buen Camino