Hello,
I can't see that you have attached a figure so I don't know exactly what you need, but you should be able to easily make these changes.
The NCL page has a lot of examples of how to make these changes:
http://www.ncl.ucar.edu/Applications/list_tech.shtml
Also, depending on the functions you are using for plotting, some of these title and info sizes are set in in your WRFUserARW.ncl so taking a look in there would also be a good place to start.