There are no official rules governing this, but many people use house rules to allow players to swap the appropriate letter for the blank tile. If both players agree, you can make up whatever rules you like at home.
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The blank tiles may be used as any letter desired. When playing a blank, the player must state what letter it represents, after which it can not be changed during that game.
No you can not
It can, but the blank tile does not have to start a word.
A blank tile is Scrabble is worth zero points. You will score the rest of the word, but add 0 for the score of the blank tile.
There are two (2) blank tiles in standard Scrabble with an assigned value of zero points.