Future Learn Online Course, "Developing your Research Project" - A free online course asking ~1 hour a week to teach a step-by-step guide to substantive academic research, as in the IB Extended Essay.
A Guide to Extended Essay A to Z - Another EE resource developed by the InterCommunity School in Zurich
George Mason University Writing Center Quick Guides - Dozens of concise guides for writing, including "Quotation, Summary, Paraphrase and Analyze", "Signal Phrases", and "23 Ways to Improve your Draft"
Online Research: Tips for Effective Search Strategies - A 3-minute video focusing on the use of Boolean Operators, quotation marks and the asterisk to enhance the relevancy of your online research.
Google Scholar: A Quick Guide to Effective Searching - An 4-minute video introducing Google Scholar for academic research.
The MLA Style Guide - This is the original source for getting your questions answered and/or reading through others' submissions. Sample papers in MLA format, practice exercises, information on academic honesty, and other resources are readily available.
The Purdue Online Writing Lab (OWL) Writing Lab - Excellent reference for the most recent version of MLA format, plus the OWL website has many other terrific information-based links for conventions and grammar, writing techniques, practice exercises, etc.
Western Washington University - Citing maps - A special page dedicated to citing maps. The site also has an MLA Quick Guide and other useful information. (NOTE: This reference has not yet been updated to MLA ver. 8, but is an excellent guide; transition to MLA 8 would not be difficult from this base.)