whats are the amps of esc i should put on the dys motors? http://www.quadkopters.com/product/brushless-motors/dys1806-2300kv/
i have 30 amp esc will that worK?
other way round ..............
wat if i put 30 amp esc's with motors which require only 12 amps of current ?

Yes , you can always use a higher amp esc

Only thing is that the max motor current should be less than the esc rating

No probs.