As he said, we need more info. However, even without such info, I can tell you one thing. Define everything carefully. Don't just put blue. Blue what? Blue sky? Blue sun? Blue dirt? This will cause instability, and unexpected things you didn't want, like meteors and the likes.
I found this on another thread. The guy said you need these:
X Biomes (naturally, if you choose single biome, you only want one)
1 Biome Controller
1 Sun
1 Moon
1 Star
X Features (Dungeons, Villages etc)
1 Lighting
1 Terrain
1 Weather
to have a stable age. Put time before sun and moon.