How to get started with PhD dissertation? (Management & Humanities)
Start writing now, every day. Put down any ideas you have.  Don't try to plan the whole project from the start. Don't wait to write until after the literature review, or after the fieldwork. Your daily writing will move the work along even though only a small part of it may end up in the finished dissertation.
Edit in response to comments.
Writing &quot;even before you have anything to write about&quot; is valuable because it can help you sharpen the particular questions you want to ask/research. You can speculate about what you expect to find (but be honest when you finally see the data). If you start writing every day  you can develop a writing addiction that will serve you well as the dissertation deadline nears.
You can rough out a version of the conceptual framework now and  refine it as you see more literature, and as your fieldwork plans develop. Don't think of the project as a sequence of distinct stages, even if the final written dissertation has that structure.
This is the short form of what my wife Joan Bolker recommends in her book
Writing Your Dissertation in Fifteen Minutes a Day.
(This answer may be flagged or deleted as the blatant product promotion it is. I hope not, since many students have profited from this advice. I haven't included a link to the title so you have to work a bit if you want to get the book. That may make a moderator hesitate before deleting.)