But it's not an overall adventure idea I want (I have one: ... ). What I wanted was suggestions for things to include. A fight, a library data search, an Imperial official? Or not?
things to include in a pre-decided adventure set that introduces traveller. let's see ....
yes, you will have to introduce personal combat. unfortunately traveller personal combat is not heroic. sudden death is always disappointing to any character, especially when just starting out, and could prove the biggest stumbling block. I suggest a red-shirt - an expendable NPC who becomes familiar and helpful to the player characters and who then takes the first hit, showing them what can happen to them if they are careless.
a library search may be boring by itself. set it up as a minor espionage job. reading is much more exciting if done in the dark, with guards and robots and camera surveilance systems lurking in the background.
yes, the imperium must be present in some fashion. customs inspections, imperial marines, a navy vessel overhead, or a slumming noble are all good intros. in the best james bond tradition perhaps an imperial investigator can be working on the same case as the player characters, from the opposite end. give him lots of high tech, credit, and imperial contacts, and the player characters may be facing their first serious patron (after some opposition, of course). this will present the imperium as a source of authority and power, independent of regina and which they the player characters may be able to access in some fashion.
other thoughts.
make sure the characters are faced with situations specifically calling for the use of their skills.
regina startown may be the site of the original colonization efforts. it may have quite a substantial underground services support system that may or may not still be in use. lots of opportunities for dungeon crawls and secret societies (if you're looking to woo d&d'ers).
a space trip of course is de rigeur. a short non-jump hop to a planetary hunting preserve (a rich man wants to hunt, lots of shooting and animal encounters), the local moon (deliver a package, legal or illegal, see how a corporation works), or the asteroid belt (interview some prospector witnesses where they live, deal with some in-space engineering emergencies, vacc suit work) should be more than adequate.