No matter where you are in your writing career, you always need assistance or inspiration.
Here are just a few sites I love.
This is a sampling of the books I use:
Stephen King On Writing
Any writing book by Donald Maas
Save the Cat by Blake Snyder
Any book by Angela Ackerman and Becca Puglisi
The Emotion Thesauruses and The Wound Thesaurus are
especially helpful to me :)