Being a little out of your comfort zone is what makes it an experience to remember. My 1st camino I was very apprehensive about things like ordering food etc as I only had about 20 words of Spanish but my concerns were ungrounded. English is the lingua franca of the camino. Try not to have huge expectations from your experience or you may feel a little disappointed, rather try to look forward to getting away from the normal daily routine of your life at home which takes me about 2/3 days and be open to whatever new experiences may come your way. Other than being in time for your flight home be open to having a flexible daily plan, if your legs are strong walk a little further, if weak, walk a little less. If you see a nice cafe then stop, maybe try lunching alfresco if the weather is nice as a change.
If you are fairly new to multi-day walking then try very hard to keep your backpack weight to a minimum, there are plenty of postings on the forum about packing lists and essential and non essential items but as its simplest: 1 reasonably sturdy set of footwear for daily walking, 1 light set for evening time, maximum of 3 sets sets of clothing: 1 to walk in, 1 you've washed the previous evening and 1 spare set, light sun hat, water bottles or bladderpack, money, passport, credencial, a minimum of toiletries, a few small clothes pegs or safety pins, a sleeping liner ( Sleeping bag not necessary this time of year ), a rain jacket or poncho and a backpack to carry it all in. All these items should have been worn several times before departing to be sure of no surprises once on the camino.
Optionals are things like a phone, camera, plug adaptor, watch, sun glasses, compact guidebook etc.
When you finish and return home, you'll be wondering why you were worrying about anything before departure, remember 200,000+ will walk one of the caminos this year, about 25% of them over 60 years of age and with far, far fewer problems than a city of the same population would experience in a month.
Enjoy and don't forget to post a little report on how you got on when you return as it will help provide assurance to others considering taking the plunge.
Buen camino
Seamus