Morrowind Scripting for Dummies is a great guide to scripting. Although it's good I wouldn't recommend trying to learn scripting from it. It is more of a reference for various functions and contains explanations of various scripts like Mad Max's riding script from Pegas horse ranch.
A good scripting tutorial would be
Dragonsong's scripting guide.
And to go with scripting there is
dialogue by Srikandi. (Dialogue and scripting become very similar at some points)
TESAME is an extremely important utility for cleaning mods of GMSTs. With Tribunal and Bloodmoon installed, creating a mod without the ESMs loaded will generate 72 GMSTs. If an esp isn't cleaned it has some bad side effects. In Tribunal you will not be able to summon Fabricants with the spell you acquire. In Bloodmoon it gets worse. You will not be able to use any of the summon spells added to the game and the werewolf stats become crippled making the game much harder when facing them and too easy when you are one. Every mod you make should be checked over with
TESAME. Lots of Dirty references are created and need to be corrected to avoid problems with your own and other peoples' games.
TR's
name generator is handy for giving your NPCs authentic names. It also saves time trying to think up names when making a mod with lots of NPCs.
Overunity will tell you files needed for a mod to run. It's a bit complicated but can generate lists and move/copy files. It can take away hours of tracking down files.
That's all for now.