I'm still in highschool but I can do an apprenticeship program to help me.
Joining the Job Core for heavy machinery operating can give you training and job placement and housing and some Grant money to get by on wile your in Trade Schooling for operating machinery. Other then that you pretty much need a Referral from some one that knows some owners of construction companies and can get you started. Some Jobs last for a long time and other are short and time between jobs are some times long. There is a machinery Operators union and they have there own training school and on the job training.