Hi Maria!
In reply to your numbered questions - and remember this is only MY opinion, and others may have more up-to-date comments ....
1. Learn the basics before you go. Hello. Good-bye. Do you speak English? Thank you! Have you a bed ...? How much is ..... and take a tiny phrase book. I would GUESS that in August there will be many other pilgrims who will help you.
2. I have never taken a tent on camino - but I believe it can be difficult, unless you sleep in designated camping areas. Any comments, peregrinos?
3. Wifi may be a problem, but you will probably have a telephone signal everywhere you go, so you can always send inexpensive texts .... and get them to phone you. You will probably still have to pay a small charge for receiving phone calls, but not much.
4. I've never been hassled by naked guys
- I think in August there will be quite a lot of other pilgrims, so you can possibly travel in a group.
I'm planning on walking from Oviedo to Melide, but not until next May!
Be happy. You are going to have a wonderful time, but be very careful, because ....... you will probably catch the 'camino bug' and want to return again and again!
Blessings from Suffolk, England.