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The 1000 would do the trick, but as quite a few people use 1000 grit sandpaper to lap their hones and it cuts faster, you might as well get it.

I'll clarify something else. If you're only getting a couple of razors and don't want to hone them with a Norton, then you need to send them out to a honemeister for honing service and then keep them...

Welcome aboard... Here are some of the answers to your questions:
1) I get along with a 2.5" strop without any issues, but you can also X on a 3"
2) 1.0 diamond and 0.5 Chromium Oxide would be a...