staking is the process of consuming the coin age (has to be more then 2 weks for asiacoin) and turning your block of coins into 2 smaller blocks which will have interests over it.
let s say i have 100 asiacoin and leave them into closed wallet for a month. i open my wallet and sync it, wait for them to stake. if they stake today (30 day coin age) this 100 coin block will split into two 53.5 coin blocks (on average, luck is involved as you compete with others on the network to get stakes)
the more coin you have the faster they stake.
So you can go on hollidays and sit on your AC they will still stake when you come back and sync your wallet
easy, efficient, .....ladies and gentleman : POS
Do you need to have them in a wallet? or could I have them at a exchange?