I am so sorry you are facing this prospect, but I hope and trust that it will not be as bad as you think.
Yes, we use our teeth to enunciate, but we do also use our lips and tongue, so with a little patience on behalf of those you are speaking to, it shouldn't be too bad. I found myself able to understand most of what my husband was saying, while he was without teeth.
Outside your home, I would suggest you wrap a scarf over your face, and if anyone is rude enough to comment, just say you are having dental work done and have been advised to avoid getting cold - or rather just shiver, and they should get the message!
Soups such as asparagus or mushroom blended are easy to eat as no chewing is involved. Other kinds of soup will probably need both to be blended and sieved.
If you like such things, custard, blancmange or any kind of milk pudding is easy to swallow and nutritious. Yoghurt if you care for it is easy to cope with too.
Protein drinks are available, but frankly most of them taste horrible!
After the first few days, you may well be able to eat mashed potatoes, mince, boiled minced chicken and some fish - probably better boiled than fried, as if you fry anything, do so over low heat, so you don't get a crisp outer edge, And don't use breadcrumbs!
Ask you dentist if they have any booklets on what to eat and what not to attempt, or can refer you to a clinical dietrician.