Everyone has given you good info. My suggestion about telling others when you're ready is to tell a couple of key people who are close to you (or let your husband do it), ask them to spread the news but that you don't want people contacting you. Then just keep those friends spread the updates. If that's still the way you feel, of course. I did it that way and people respected my wishes. Then I started a blog and sent out the address. I found it much easier that way.
Try not to get too far ahead of everything (and stay away from Dr Google). This is probably going to be one of the hardest times of the next few months - somehow, when you have a definite treatment plan and you know what is likely to happen, things calm down a bit.