Loads of good advice above. I'm sure most of us have gone through the clown face phase (I know I have) CIS women go through this too, just for them it is when they are young girls. We aren't born knowing how to do makeup!
My tip in addition to those above is to look on you tube and follow tutorials. I think it's important to go for tutorials with women who are your own age or those designed for women your age as make up styles and technique vary as you get older. Learn more about skin tone and undertone, have you got hooded eyes, contouring and so on as they can guide your product selection.
Observe women your own age and see how they have applied theirs (same goes for clothing and mannerisms) and Lori's mantra that Less is More is so true.
I'm no expert by any means, I'm always trying new things and experimenting (sometimes with comical results!)
You'll get the hang of it.