If you have been working in windows for long then all these things are obvious. No need for long pages of explanations. Its all implied. 

Its not possible but you can write your own script to do at one go. And you can use this script in any database and server.

I am just giving outline...

It all depends how many rows/pages your query returns. Clustered index seek is good for range selection (means more data/pages) and non-clustered for a particular (less) records.