when does a transaction get registered / included in a block [migrated]

when does a transaction get registered / included in a block [migrated]

I want to know when does a transaction gets registered in a block ? Is there any queue type of structure where the transactions get stored before getting included in a block by miner ??? As in let's say if i have transferred 1 eth to my friend and announce that transaction to the block chain, how much time will it take to get included in a block and block to get attached to the block chain ? And also on what basis miners select which transactions to include in the block, is it on the first come first serve basis ? And if they don't want my transaction to get included in the block they are about to mine then in that case what happens to my transaction and the amount of ether i have send to my friend ???

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