Stephen King's On Writing makes a very clear point about your -ly words: The adverb is not your friend. If you have a verb that you feel needs modifying, it's probably best to pick a stronger verb. New writers commit this crime most often with dialogue attribution. Some of King's examples: "shouted menacingly," "pleaded abjectly," "said contemptuously." I guarantee you, an editor will strike through all of those. The best form of dialogue attribution is said. It's a winner every time. Other words will get in the way of the dialogue flow and distract your reader. A character's words will tell the reader if they are menacing or pleading or feeling contempt. Another good choice is to use action tags. Here's an example, first with an adverb of death:
"I'm ready to leave," she said tiredly.
Or with an action tag instead:
"I'm ready to leave." She rubbed her temple and checked her watch.
The action at the end of the second sentence shows you how the characters feels, much preferable to the first sentence which tells you.
King uses a lot of examples and rules from a terrific little grammar text called Strunk and White's Elements of Style. It's a slim volume full of invaluable information. I bought my copy for $10 at the same time I bought On Writing for $8. That's a much better value than the $300 I spent on a college creative writing class years ago where all I learned was how much the professor hated the publishing industry because they wouldn't publish his literary masterpiece. While it's true that sometimes you get what you pay for, sometimes a good deal is far more valuable.