help!!! overwhelmed, back home with 3 kids

I need support, help, I feel so overwhelmed, I've been crying 5-6 times
a day since I arrived here a week ago. I'm not crying over leaving my
husband and miserable marriage of 11 yaers. I came back to Canada with
what could fit into 2 hockey bags with 3 kids, one who is 14 mths. old.
I have a little bit of money, very little, I enrolled my 2 children in
school and they've started and seem very happy, and I've enrolled in
the real estate agent course phase 1 of 3 to get a real estae sales
license, to get a job and support my family. ...I'm scared. I have a
supportive family who is helping me the best they can. I'm 38 yrs. old
and living in my father's house where my 2 older sisters and their
children (2 adult age) live. I feel like I'm imposing on them and
sometimes I can feel the tension.
I feel like my head is so full of thoughts, emotion and god knows
what else, I can't even think straight, I can't seem to even get a plan
straight. I've started school but finding time to study properly has
been such a task this first week. I try hard not to think about my
husband(x), and waste my neede focus and energy on my anger and
disappointment for him. I try to stay focused on moving forward and not
looking back other then to remember what not to do. I just feel so
overwhelmed I can't think straight.
So, what do I do , I mean a game plan. Are there any real estate
agents out there who can give me some advice on what kind of career
this is? Any advice about any of this would be so appreciated...thank
you