Making a Android game, need some starter answer

Okay, im trying to make some idears to a Android game, but

How do i start?

Do i start directly from making it to an ANdroid platform, or should i start make the full game in Windows Platform, and later then make it to android?

What do you do, when you are making a android game?

Answer please!

Unity allows you to make for a bunch of platforms. So, you do not have to do anything special, beyond make the game. Just consider that you are building for a mobile and must then be sensitive to memory. When you have something, Build Settings is what you would need to look at.