Let me share some insights, I hope it will be useful. I will break down my answer, based on your question's main dimensions, that is help, knowledge and motivation. Speaking about the first dimension, it is unclear to me what do you mean, so I will leave this aspect for you to clarify and for others to address.
In regard to knowledge, the best advice I can give is to get a decent book specifically on writing literature reviews (i.e., Hart, 2005) or, even, a good book on research methodology, which has comprehensive enough chapter on the topic (i.e., Booth, Colomb & Williams, 2004; Creswell, 2007, 2014; Davis & Parker, 1997). This is just to start. More importantly, IMHO, after you will read some theory on writing literature reviews or research manuscripts, is to start reading real literature reviews: either review/survey papers (for Computer Science, there are specialized journals that publish such papers, for example, ACM Computing Reviews and ACM Computing Surveys), or simply focused research papers on the topic of your interest (most of them will have a corresponding section, which is usually titled "Review of Literature", "Introduction", "Background", "State of the Art" or similarly).
Speaking about motivation for writing a literature review, that IMHO should come from your excitement about (interest in) a particular topic. If you won't have excitement or, at least, enough interest in a topic, I don't see how you can obtain motivation. It's that simple. Your other questions are rather broad, but I'm sure that you will be able to answer most of those questions after reading some foundational literature on research methodology, as I recommended above.
Booth, W., Colomb, G., & Williams J. (2004). The craft of research (2nd ed.). Chicago, IL: The University of Chicago Press.
Creswell, J.W. (2007). Qualitative inquiry & research design: Choosing among five approaches (2nd ed.). Thousand Oaks, CA: Sage.
Creswell, J.W. (2014). Research design: Qualitative, quantitative, and mixed methods approaches (4th ed.). Thousand Oaks, CA: Sage.
Davis, G. B., & Parker, C. A. (1997). Writing the doctoral dissertation: A systematic approach (2nd ed.). Hauppauge, NY: Barrons Educational Series.
Hart, C. (2005). Doing a literature review: Releasing the social science research imagination. Thousand Oaks, CA: Sage Publications.