No worries
@SantaMonicaPeregrina - we were all first time walkers once! All questions welcome.
Sleeping gear: September into October can get cold on the Camino Francés. Using albergues, I would not do it without my warm sleep system (as described below).
A sleep sack is also known as a sleeping bag liner. They come in cotton, silk and synthetic and various cominations. Mine is silk, with a stretchy panel down the sides, to allow movement. They were designed to wear inside a sleeping bag, for added warmth and to keep the sleeping bag clean, but many of us use them as a substitute for a sleeping bag, and our special "hack" is to add something warm inside them. Things over the top tend to slide off.
Which I how I use mine. As the outer layer, with a lightweight down camping quilt
inside.
And my answer is yes, I would spray with Permethrin before leaving home. I also take a lightweight dry bag into which I put all my sleeping gear, and seal it before putting it into my backpack. In the hope that if I do manage to get bedbugs, they will not contaminate all my pack. It is not a complete solution but everything helps. Lots of threads on
bedbugs.
Here are many threads about sleeping bags, which should also help.
Toilets:
Don't worry, your question is one asked by just about every woman who is contemplating the Camino.
I don't think it is necessary to take toilet paper, but I usually have a tissue in my pocket when I go into a toilet, "just in case".
Here is a thread on toilets and
here and
here. There are others, but that will probably give you enough information.
"Public conveniences" are not a common thing in Spain, but everyone uses the ones in the bars, of which there are many along the Camino Francés. I'm 70 but rarely find I need anything else. Be like the Queen, never miss an opportunity. It can be a bit circular, it is polite to buy something, if you use the restroom, which often means a drink, which often means...
Everything will unfold for you once you start walking. Have fun. Buen Camino!