We all need Stardust, and it is not quick to get, but to power up, we need a bunch. The only way to get it is to capture a Pokeyman or hatch an egg. (A third way is to defend a Gym for 22 hours I think, but have not been able to prove it or stay in a Gym that long)
But, hatching eggs is more important than I thought. Since you only get 100 Stardust when capturing a Pokeyman, it takes a lot of captures to build up a reserve. So I grabbed a screenshot when an egg hatched and was surprised to see that hatching this particular egg got me 1277 Stardust. Some give 400 some 1400+ so I will now place more emphasis on hatching. Here's the screenshot.
Mods, please move to appropriate area if in wrong place... I just wanted everyone to see it
So here's the update:
You do get 500 Stardust when you defend a gym, so if you take over a gym, you get 10 coins and 500 Stardust!
But I am not sure how it works if you add to a gym. But today, I am going to visit gyms and try to find out!!