Thanks a lot, Karajorma!
Yesterday I played around with FRED once more. I even remembered how some things work from the time when I was trying to FRED some years ago.
My main problem is maybe that I have too much fun seeing cruisers blow stuff up, for example a group of transports or a starbase. I can watch that for hours. (which I did yesterday). Also my time is a bit limited which is also the reason why I didn't learn to FRED earlier.
But at least I figured out how to do asteroid fields, some backgrounds with huge planets and suns and so on, patrol routes, mission objectives based on destroying things, setting cargo and how to enable scanning, how to end the mission when landing on a ship and some other basics of the editor.
I even did a small mission where you start from a star base, scan some freighters finding the one with the drugs and then it becomes hostile and you have to disarm it so it will give up. Then you land. End of mission. Simple but I could practice a bit with triggers, objectives and stuff.
I just had some weird effect that the ship I was supposed to land on became some sort of ghost I could fly through. No idea what I did wrong. I think it is somehow linked with one of the triggers I used.
By the way: Can anybody point me to a tutorial or something to make ships flyable? As I mentioned before I'm planning to do some Kilrathi missions and for that I'll need at least a flyable Dralthi.
EDIT: Sorry for derailing this a bit. The picture looks good btw.