project_db.dat is on the root of your data folder, wherever you placed your quest files
the link from Diarandor went directly to what you asked for....
eg. if your map is called john and the destination you want him to be at is called purple
watch all of Chrisopho's tutorials - they are seriously good, even if you think they aren't relevant to what you want to do, watch them. They have information far beyond what the title suggests, don't just watch them once either, go back and watch them and over time and you will see how something that he does which seems silly complicated at that point to you makes a bunch of sense now. You will also find that he does little things which help your creating, for example when he makes a cave he doesn't plonk down some teletransporters, a destination and then go for it, he will take the time to make a perfect cave, and explain to you how the layers are working or why this certain tile is better for the job at hand. Even now watching them I am still learning new things
read the API...I know its hard. but try and do it...luckily there's so much to be doing whilst making a quest that you have so many other things to occupy your time whilst you are stuck on something else...get into sprite making/editing....that sure occupies your time