Ok i read the rules once through and must have missed something i didnt see the rules about developments, but it does show them quite often in examples. I am asking how do u use, place, destroy these particular parts of the game. Help would be appreciated thanks.

Look in capital phase section in the rulesbook p. 11.

You can play 1 development during your capital phase each turn, 1 card of your hand place face down in a specific zone, it add 1 life to this zone.

Once placed face down (and no you don't have to pay for them) you may look at your developments at anytime, but that is the only way you can interact with them (and your opponent may not look at yours) with some specific effect that says otherwise.