Use ‘roadmap’ sentences (those that give the reader a clear sense of where things are going) and introductions and conclusions that align to exactly what you say are going to do. Connective tissue is needed throughout each paper to help the reader understand the paper’s organization and how ideas are related. View Pan and Expository Paragraph Writing for guidance.
If you are responding to a content-related question, clearly indicate how you will go about answering this question definitively.
Since you are not doing a study yet, avoid calling your literature review a study. This is a review of the literature, not yet part of a proposed study, and it also does not need a clear theoretical frame at this time.
Ensure that any comment from a reviewer is applied throughout–often, if you are making this error once, you are most likely making it throughout your document.
If you are making truth claims, they must be backed up. Anything you are claiming as fact, or claiming as what is “known” must be backed up with literature, otherwise it is conjecture, or from your own personal experience, which must be made clear. Otherwise, you will unintentionally plagiarize.