I'm not planning on using any of the older material that isn't in the new book (cause I don't have any of it, and I'm not interested in converting anything), so my question is how much can I do to get ready right now?
Are all the generation systems filled in enough that I might as well just wait for the book?
How much fluff is in the book as far as set alien races?
1. You can plan the story, sketch out personalities and motivations of the main NPCs. You can prepare your background, write a short history of your setting. Make up the names and overall strengths of merchant corporations, empires, roguish free trader captains, corsair bands.
How big is the core of "civilized" worlds? Or is it a big mixed bag of worlds (like the Dumarest novels)? Or is it a bagful of little pocket empires, a few systems each?
Sketch out star systems and main worlds if you want to, cities, starports, bases, and think up alien races. Is there a big construct out there, a ringworld, or a rosette system?
Traveller is adaptable to rolling-your-own setting, though before you start working out space travel, I recommend first understanding how Traveller does it. Then do what you like.
2. The tools are all there.
3. There is considerable fluff for
creating alien races, but there's no pre-made aliens in the book, ready for you to use. However, there is considerable interest in porting aliens and starships into T5, so *I* expect to see a free PDF with that sort of thing. At any rate, the aliens from previous editions are usable, and aliens from any setting can be statted out using T5, so figure out what you want, and then port them in later.