The other planets in your solar system are already outposts. The next steps for you would be to send out probes to start exploring galaxy. Once your probes find some new planets in nearby star systems you'll want to start creating new outposts (or colonies) so you can start building up the amount of CO / RO you're collecting.

In case you haven't see this thread Raven gives a pretty good overview of how to approach the game. (people's play styles may vary but it's a good starting point over all.)

http://www.zarksoft.com/cms/showthre...of-the-Eclipse