Research community colleges in your area. They usually include vocational programs and are affordable. Some of them have programs designed to lead to jobs in local industries.
Make sure they know how Pell grants work - that:
-they're free from the gov't
-they don't have to be paid back
-the $ amount available depends on your family income so it works in their favor for once if family income is low
-depending on the above, the Pell amount might pay for some or even all of the classes that they want!
-they're only available if their classes are part of a degree program, but it can be a two year associate's degree
Also:
-if you stop making progress toward the degree, you stop getting them
-if you flunk too many classes, you stop getting them
-so if you're going to flunk a class, drop it early enough in the semester so the course is shown as a drop, not an F
And:
-if they live away from home (outside their parents' house; they can live in the same town) for a calendar year without family support, they become independent for financial aid purposes, which depending on their own income and their family's might increase the amount available to them
https://www.thebalance.com/should-i-apply-for-a-pell-grant-2386206