Three “How to”s, mostly about post id

Hi!

I’ve started building my WordPress blog on my computer (using Xampp). Before I’ll upload it to the cyberspace I’d like to tweak it a little bit and there are some tricks I haven’t managed to do. Please help me out about:

1. How can I set the post’s slug to be automatically the post id?

2. How to set a signature that will be added to every post automatically, says: “This post id is 123” (while 123 changes for every post)?

3. How to add the post id to the info that shown about every post at the archive page?

Great thanks!!!