I am having trouble with this roller-deere part in solidworks

I attached a picture of what I have so far and a picture of the part I'm trying to do. I have a bunch of undefined dimensions and I'm not sure on what I need to do next. I tried looking up youtube and googling for this part already, but I couldn't find anything on it.

2 Answers

Select the left most, vertical, blue line.
CTRL click the origin.
Choose Vertical, or Coincident.

It looks like you just need to be "connected" to something. A dimension would work as well, but I think a relationship would work well in this case.