This site has a plethora of workouts designed for everyone from the Beginner to the Advanced Swimmer.  Anywhere form 600 yards to 3400 yards. Work your way up at your own pace.

A workout should have a purpose and methods to achieve that purpose.

Here is an example of how to layout your workout to give you a more complete session in the pool. 

Here is a little article on Freestyle Breathing.

Just the basics that everyone should work on.

soon

soon

Don't say "I don't know any drills". 

Here you go, dig in.