Mind Mapping Steps
There isn't really a correct 'order' to producing a mind map. Mind mapping is to do with generating/collecting points in relation to a topic in a way that enables new points to be linked to previous ones or become new ones.
Consider the 'title' in the centre of the page as the book title.
Add to this the 'chapter titles'.
Then from the chapters note the 'paragraph' tile words.
Then from the 'paragraph' titles come the 'sentence' titles.
The flow of points will not necessarily be produced in this simple flow. You may have some 'chapters' progressed to 'sentence' level while others have not yet reached the 'paragraph' level.
You may initially produce a simple printed-word map just to capture the points, then reproduce it incorporating images, colour coding of words, printing some words in capitals, shading or putting shapes to highlight other points, connecting arrows etc.