As someone who only intermittently logs on (mostly to send duty officers off), what will we have to do to set up the starbase, exactly? Stockpile resources? Play specific missions?
Building up the base involves fleet members contributing toward projects selected by fleet leaders and senior officers. Each project has different requirements but in general they require fleet members to contribute stuff like equipment, commodities, crafting materials, bridge officer experience (to be renamed expertise soon), duty officers, refugees, dilithium, "Fleet Marks" and possibly more.
"Fleet Marks" are be earned when you successfully complete new fleet actions that will be released in Season 6. They include starbase defense (space and ground), convoy defense and "No Win Scenario" fleet action.