Good online resources for teaching students how to write a research paper
First-year undergraduates are rarely taught to write research papers; in my experience, the skill set you look for is taught to Master's students and PhD students. Look for self-help books intended for PhD students. To name a few,


Umberto Eco's How to Write a Thesis is a brilliant insight into the subject, dealing with questions such as "I am a student of some obscure subject in some distant town in the middle of nowhere, how do I start?".
How to write consistently boring literature by Kay Sand-Jensen is more of a style guide and a check list, but it's definitely a valuable extra reading.
The Unwritten Rules of PhD Research by Marian Petre and Gordon Rugg walks aspiring PhD students through every aspect of their new lives, from working with a supervisor to writing all sorts of articles to delivering a viva.


Please make use of resources in these answers: Learn to write scientific papers in medicine, Are there resources for learning how to write a scientific paper?