i dont know all, but where's what i do know.
1. sorry, havent worked much with placing things, so i dont know.
2. make journal entries. here's a tutorial - http://www.tamriel-rebuilt.org/?p=modding_data/tuts/sfish/npc
3. in the CS, on the menu bar choose "character" then "faction"
4. have conditions on your dialog to start the second quest. assuming you use journal entries, set the condition to the dialog to the name of your journal entry, and the required index, or, if you like, you can create a global variable that is 0 untill the first quest is completed and set to one when it is completed, and use THAT as your conditional.
5. the dialog editor in the CS. the tutorial i linked above covers the basics, this archived forum thread is full of tips and things to remember - http://lovkullen.net/Emma/Comprehensive_Dialogue.htm
6. i believe that even attacking a faction member results in expulsion by default.
7. any NPC with the class "guard" counts as a guard. just make a new NPC that is this class and place them in the game world (or use some of the existing ones in default morrowind). remember to check the "respawn" box or use leveled list spawns if you want the guards to respawn, or do not do these things if you do not want them to respawn.
8. you can attach a script to the NPC in question that does -
if ( getitemcount, "ID_of_clothing_article" == 1 ) equip, "ID_of_clothing_article"endif
for each item of clothing that you wish to force. what you may want to do is make copies of the items you want equipped with a unique item id.
you can also uncheck "auto-generate stats" set the light, medium, and heavy armor skills to 0 and unarmored to 10, or something similar.... so long as unarmored is highest. i THINK. the MCP also has a fix to prevent merchants from equipping things sold to them, which you may want to use in your game or recommend to users of your mod.
you may want to check this thread out, it's a listing of tutorials. -- http://www.gamesas.com/index.php?/topic/24-comprehensive-tutorial-and-useful-link-list/