"1) Hastati(80)(440d/170d) - will be the initial backbone of the army.(Only option against the Gauls)."

Question when you say '80'. How many hastati do you have to train to get 80 men? Maybe that wasnt very well put, I mean when you train a unit correct me if im wrong but you dont train x number of men you train a unit of them, how many men go into one unit?