First two guesses (both incorrect)
Newspaper, and story
Are you (I don't think you are, but worth a shot anyway)
Following what's happened before, this is what you were waiting for.
When you write (especially sequels), your plotline tends to follow previously told stories (ie. the Odyssey follows the Iliad). You might be waiting for the story especially if the previous part ended on a cliff hanger, or you might be waiting for a spark of creativity/inspiration.
I guarantee you I won't bore, I'll leave you breathless, wanting more.
Good creative writing yields really interesting stories and the twists and turns and cliff hangers can leave people on the edge of their seats.
Very exciting, I'll amaze and astound,
This seems to be a rehash of the previous line.
Every writing, will keep me laying around.
Every time you sit down to write and use your imagination, you're bringing your creative writing skills into the physical world.
As for some additional hints:
"Exciting parts" could refer to writing interesting parts of a story which contain all of the action. Certain parts of the creative writing process are also more interesting than others, I'd imagine
The first letters of each line spell FIVE....creative writing is a five-step process from your hint below?