4- Be logical in your progression. Try to be logical and gradual from chapters to chapters (for this, generally there are common templates, like the OHERIC methodology: Observation/Problem introduction, Hypothesis/Your Model, Experiment/Simulations, Results/Interpretation, Conclusion/Opening) but also inside each chapter, so that the end of a chapter naturally leads to the next.
Usually, the introduction is the hardest part and usually too much overlooked so you should really focus on this part ; the conclusion is the easiest part (just summary what problem you tackled, what you did and what you've found and potentially future avenues that could extend the findings on this problem) ; and the abstract and title are done at the very end when you already wrote the whole paper.