Either A) Whatever you currently have ideas for or B) One section of the universe at a time. It's better to have a part of your galaxy partly done, including ships, outfits, spobs, etc. for that area, then to have, say, 100 ships with nothing to put on them or nowhere to fly them. Doing all of a specific resource at once just ensures you'll be having to rebalance, or even completely redo, the whole lots down the road. Well, more so than building various resources together.
Alternatively, you could also do C) Build from the plot-up. Start off making only what you need for your storylines. The planets, ships, weapons, everything that'd be required to play through those. Then go back and add everything else, like filler.
Personally, I suggest doing A when inspiration hits you and it will further your project, such as a cool weapon idea as opposed to some complicated method to allow a player to "summon-monsters-Final-Fantasy-style-that-may-or-may-not-work-and-if-it-does-will-probably-be-really-buggy-and-granted-it-would-be-a-minor-feature-in-the-end-anyhow". In other words, practical ideas. Once you're out of your practical As, then do B or C, whichever method you prefer. Finally, finish it up with your impractical As. But, keep in mind, things you add later can force you to go back and make many changes to older stuff. For example, when I added the Needle Rocket to Colosseum, it came rather late so I had to go back and add it to A.I. ships and then rebalance them around both them and the player having that weapon.
Colosseum was a mixture of A and C, for trivia. (Arguably B too, but only because the whole TC was one section of its universe).
This post has been edited by JoshTigerheart : 25 August 2009 - 06:51 PM