Do you need a writing guide? Maybe. Or maybe not. I haven’t used guides until a few days ago when a thought occurred to enhance my dialogue.
I searched web using words such as “he said dialogue” and I found this guide about writing dialogue. It has some good tips that I’ve already applied some of them (but only those that I feel is right for me) in my novel. One of the tips is especially good and I’m in the process of applying it and learning to apply it:
Another good page about writing dialogue is here in Writing-World.com.
I discovered once again that writing is a learning experience and you can’t learn unless you do and write and (self-)publish.