Does anyone know how to create a quest marker to a location such as the riverwood trader? and also how to create a quest marker to an item such as a note that i have placed in the world?

also on a side note, how do i create lengths for my dialogue, so it doesnt just skip over them all, and my ending one is so endlessly long, that it takes forever to proceed?

make a quest with an alias on it, fill that alias with your desired item, add an objective to the quest, give the objective a target, make that target the alias you just created, start the quest, display that objective, done.

To create a quest target you first have to make an Alias for your quest target whether it be an object, actor, or location. If you don't know how to create an Alias see here http://www.creationkit.com/Bethesda_Tutorial_Quest_Aliases. Then you have to create a quest Objective pointing to your Alias http://www.creationkit.com/Bethesda_Tutorial_Quest_Objectives

As far as the length of your dialogue I use this to extend the length of my dialogue. http://www.nexusmods.com/skyrim/mods/30423/?