Hopefully you`ll visit this thread again to read this:
Initially, build up to 50 housing total, 50 ag. total and 400 total commercial (impossible initially so build as much as you can). Build an extra point of mining to speed up the process of getting ORE from your homeworld.
Research Commercial infra, and only that type. Research it to level 10, pausing occasionally to use the ore mined from your homeworld to build more infra on it.
By now you should have plenty of money to explore. Explore for two planets using 80 Viator scouts, then disband them. Mine the planets out of enough ore so that you can finish building up your homeworld. Then come and ask what to do next.