Halo Combat Evolved
This tutorial by dg945 will allow you to create your own main menu (UI). It does go step by step, though you may have to watch it a couple times because it goes fast.
This tutorial will show you how to rig and get in game a custom biped so that it uses Master Chief animations.
A Modding Tutorial - By RobJohnB95.
Shows you how to create a simple level using gmax. (part of my halo map making tutorial)
My total modding tutorial that has a tutorial for almost everything you need including hht, hmt, sparkedit, pmi and console commands and the basics on gimp, gmax and hht/hmt with plugins now has pictures and the start of a ce tutorial.
This tutorial covers everything to do with hht, hmt, basic skinning with gimp, sparkedit and pmi - BY SOULSOFMODS.
This tutorial will guide you on how to play as and Elite on bloodgulch.
Version 3.0 of Jackle's Modding guide is now up! This version features six formats for widespread use (including .txt, .utf, .htm, .doc, .rtf, and .xml) as well as a number of additions to the guide.
Version 2.0 Of Jackle's ultra useful modding guide.
A video tutorial by theguy2042000 explaining how to make your own custom weapon in 3ds max and getting it into Halo Custom Edition for use in custom maps.
This is a PDF describing the process of how to make your own custom sky for Halo Custom Edition. It does go step by step and provides pictures as well. It is a good download in conjuction with FD04's Outdoor tutorial.
This tutorial by Aztec & SRG will show you how to add AI into your Halo Custom Edition maps.