ok ive seen on MMowned that there were a lot of questions about how to make a chain quest so here is a small guide for that...,
Fist open your quests table in you navicat or whatever, then add a new entry at the bottom fill it accordingly to your needs, (PS. for talking quests you need to use flag 4 for killing or giving some items is flag 8 and for party or raid killing you need to put flag 8 in special flags) then to make it a chain quest you need to fill in acordingly in the columns that are labeled prevquestID and nextquestid and thats all :P, also you can fill in accordingly in required quest id almost at the end so you need to finish that quest before you can take the next one :P