Here is a good place for all you Gunpla fans out there to post your painting (and really, customization in general) tips!
and No, I personally am not asking for tips.
I'm making this so that other new Gunpla people have a place to come to if they have questions about customizing.
My first and foremost rule would probably be follow your heart!
Customize whatever kit you want!
Also, try new methods and colors! Try repaints! trying new things is very good.