Janet
There is nothing I can tell you that might has not already said. But I can just add in my thoughts here. Start building the relationships before you need them. Make it a point to get to know other people and ask what you can do for them before you ever ask for there help.
I don't mean best friend type of relationships but get people to know your name. This can be done in a number of ways. I have found offline contact works great to get the ball rolling.
But getting JV's is about building and keeping relationships.
Thanks
Charles