When creating a new map always select and save as starfleet command metaverse map.
After choosing the size of your map, smaller is better.
After this you get to the Available Properties window. Double click once on Economic. You will see it added to the right column. 100% of the hexes will now have an economy of whatever value is listed there, usually default is 5.
You can then add in other properties like impedence, better at 1, and then Strength, Region, etc. Play around with what properties of terrain you allow to be 100%. You might want a mixture of asteroid, nebula and empty hexes. It will be randomly seeded. You can similarly do the same to Regions and in the right column use the drop down menu after clicking on each one to change the race. Problem is that there is no visual filter for seeing terrain. So you have to zoom in to see it. Bad idea to put planets in nebulas.
There's a lot to it, but that will get you started.