PhD Dissertation Help: Guidance, Structure & Writing Support

I need guidance on how to structure my PhD dissertation. I am also trying to figure out the best way to organize the chapters and present my results clearly. Has anyone here used a Phd dissertation help service or something similar? If you did, did it really help, or was it not worth it? I would also welcome any recommendations for other books, tools, or writing methods that helped you keep moving and stay on schedule.