You basically just start from the beggining and they have a job automatically when they enter the house. For the question; Can the children get married its the same answer. I really hoped this helped!
It takes 4 hours for the baby to grow into a 2 year old. I don't know how long it takes for them to become 18 yrs tho. All I know is that when they're 18 they go off to college.
I've been playing sims for like almost two years now. And I make my sims have babies all the time and from my experience this is how it actually happens: Babies: 3-4 days Toddlers: About 4 days...