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RilAgrail, here's what you need to do:
1) In the objectives, for all main quests, change DieInWeekWithoutTown from true to false.
2) Create a trigger for a region that matches your portal. There's plenty of information about this, so I won't go into detail.
3) (Sorry, I don't have the editor handy. I remember that you need to create all the missions first, and then combine them. This is done in one of the tabs at the top of the screen, I think. But it's best if you download a campaign (like Islands of Mystery) and see for yourself.