Getting Started: 
Getting Started - MUN Mission and History
MUN Glossary of Basic Phrases/Terms

Country Research: 
Getting to Know Your Country - Country Profile questions to answer
Country Profile & Policy Map
Country Information by Region
Researching Your Country - UN Country Statistics Database
Researching Your Country 2 - UN Member States General Information
Researching General Information on the Types of Issues You Will Debate

Researching the Issues for Your Committee:

1. General Assembly (the official UN divides the General Assembly into different “main committees.” For MUN, you don’t need to consider this) 
2. Human Rights
3. ECO/SOC
4. Security Council

Resolution Writing:
The Basics of Writing a Resolution
UN Digital Library (search for any past resolutions/other documents, or just type “resolution” to see all past documented resolutions - for your preambulatory clauses)

Official Past Resolutions (may also include other documentation): 

1. General Assembly
2. Human Rights
3. ECO/SOC (2021 documents)
4. Security Council

Lobbying & Merging at the Conference

Strategies for you to become the Best Delegate
Debating: "Making it up"
"Framing" Strategy of breaking down your topic into smaller ones
How to debate resolutions
5 skills every delegate should learn

Understanding the Universal Declaration of Human Rights will help you to win debates. Have this infographic next to you for ammo during your next debate. Below the infographic is the official document from the UN, and then an even more detailed tutorial with descriptions and infographics.
Infographic - Universal Declaration of Human Rights
Official PDF from the UN - Universal Declaration of Human Rights
Extreme detail Infographic & Tutorial - Universal declaration of Human Rights