According to Arrian he crossed to Asia Minor 30,000 infantry including light troops and archers, and 5,000 cavalry.
25
Between 300 and 400
Alexander is called the "Great" because he was the head of his armies and the one who's planning and strategies enabled them to be victorious over so many territories. The soldiers who fought for him just followed orders.
It wasn't soldiers who invented machine guns.
He was a consistently victorious leader, and looked after the welfare of his soldiers.
he took over 5,000
yes
2
About 37,000
50,000 men
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By taking the eastern Mediterranean coast to secure his base and source of soldiers, and to ensure no naval invasion of Greece, and then turning to destroy the main Persian army.