No, only you can see your ads. In the list of your ads, if you see an "Enable" link, then it's disabled. Clicking in will enable your ad.
Do you have JavaScript enabled? It needs JS to be able to toggle. Also make sure you don't have something that alters the page itself (like ad block software).
It's not possible to have a CTR since linking a keyword isn't an "impression". There could be 10 people bidding for the one keyword. There is no way to know which ad a click would take someone to until AFTER they click. You certainly woulm't want everyone bidding on the keyword to all get an "impression" for the one link.
Depends on your keywords... if they aren't that popular to begin with, there's not going to be many places for them to show. If you search for a post with one of your keywords, do you see your chosen keywords linked in it?