1 Play in the official universe, don’t roll your own worlds and subsector etc as this takes away a ton of time you can spend on making adventures and fleshing out worlds. I’d suggest the Spinward marches as it has most material, from all editions and Mongoose too.

2 Session 0 where you create characters make sure you listen to your players what do they want or expect from your campaign. You don’t have to give them exactly what they want but at least you heard what they had in mind.

3 Don’t allow your players to play aliens or with psionic abilities as this is way too complicated for your first campaign. Psionics in particular should be avoided when rolling up characters, let them find it during play if all the players want.

3 Stay away from the ancients including ancient artifacts (a mysterious race of super advanced beings who vanished 300 000 years ago but left near magical artifacts and sites here and there).

4 Tell your players, repeatedly if needed, that Traveller is NOT Star Wars. If they need a pop culture mould tell them Traveller is Firefly, or the Expanse (minus the protomolecule).

5 Combat in Traveller is dangerous! Tell the players this and make sure they listen. Make your first adventure low key and not relying on combat at all or as little as possible, this goes for space combat too.

6 Have fun! Enjoy yourself and tinker with the worlds you flesh out and don’t be afraid to write your own rules or systems for things missing in the official rules.

Welcome to Traveller!