Re: my ad
1. Do you have impressions / clicks in your account?
2. On ad preview tool normally you will see if the keyword which you are testing is triggering your ads or not.under "
Showing ads right now?"
3. Alternatively also if you browse to your keyword tab and move your mouse over in status column a bubble will appear showing you diagnostic for that particular keyword.
I would look closely at quality score, avg position and impression share metrics to find out exact issue with your account
Hope this helps