Checklist
0. Preparations Phase
0.0. Pick Options
Work with your Referee to establish what Optional Rules apply to your game. Note these down for future reference.
0.1. Pick Culture
Pick a Culture that the Traveller comes from (consult with your Referee for options available for this game). Note down special rules that apply for this Culture and the list of Species that are part of it.
0.2. Pick Species
Select a Species for the Traveller. For a typical Traveller game, it is recommended to go with species that are dominant or major elements of the Culture, as noted in Culture description. Note down any special rules that come with the Species/Subspecies selected.
Note: Sex/Gender may affect statistical and social constraints for some Cultures/Species and for the purposes of this guide will be handled as Subspecies in relevant cases.
0.3. Pick World
Scout the Charted Space Map for a world suitable as your Traveller's place of origin or work with your Referee to establish one. Note down its Universal World Profile (UWP). If it is a canon world, read up available info on Traveller Wiki about it for any roleplay opportunities.