Your questions answered on how the alphabet came to be in its current format and order.
The modern English alphabet is the 23-letter Latin assortment with three additions hastened by the invention of movable type. W starts showing up in English letter lists in the 16th century, replacing the previous literal double U (or V) that denoted our current W sound. Naturally it was placed next to the then-undifferentiated U/V. The I/J and U/V cleavages came later – though the different shapes had existed for centuries, they weren’t considered distinct letters in English until around 1700.