I grew up with sci-fi movies and it's my first love for fiction...Star Wars, Star Trek, Battlestar Galactica, Alien, Close Encounters and all the amazing cartoon series like Battle of the Planets, not to mention the games like Elite and the X series by Egosoft that I spent a long time with. An amalgamation or combo of any of those would be great. Imagination is the best gap filler when a story is told and playing a game that encourages creativity and imagination to tell a story is very compelling to me. Trading, combat, exploring all appeal.
There's so much available in the Traveller Universe that it would be remiss of me to ignore it. So, once I figure out the mechanics of the game, I'll start looking into this side of it too.
In terms of protagonists, I don't know. Somewhere between one and a small crew to begin with probably.
I guess everyone who plays Traveller has their own take on all your questions and that is another reason I'd love to learn to play. Having spent probably hundreds of hours with AD&D as a teen, I'd like to go with something sci-fi themed now and Traveller is so massive in scope that I would imagine it could fill years of play time.
What's your experience with the game?
I grew up with SF in books, TV, and eventually movies. I got into DnD when it was the only game in town, and got Traveller as soon as it was available, played it in high school, bought various versions over the years, but was playing other RPGs. I haven't gotten to play Traveller again until 2023. Sigh... I'm old...
My current game centers on a cook/food journalist whose scientist Vargr bff was just given an old lab ship for unknown and suspicious reasons. I would describe it as
Gilmore Girls meets Food Network in (Charted) Spaaaace. It's not the game I ever expected to GM, but ya play with the players ya have. (There's another branch of the game featuring a couple of Scouts doing Scout stuff, but it has been repeatedly delayed by scheduling difficulties.)
So your game can go in whatever direction you want.
Adding to what
@Reisender said, the Core book is all you
need. If you want to play in an official setting, one cheat you can do is get the Library Data Little Black eBook:
https://www.mongoosepublishing.com/products/library-data-ebook It doesn't have current level art, and the information is outdated. I tell my players it's the Imperial Wikipedia. And there's this:
https://wiki.travellerrpg.com/Main_Page
Another thing you can do it look at the blurbs on the Alien books, decide which ones you most want in your crew, shooting at you crew, or both, then pick a part of space where those aliens hang out and look for source information in that bit of space.
If there are themes or scenes or moods you want to shove your characters through, toys you want them to have or try to get, or other ideas, I can try to make more cogent suggestions.