Legends and Plot starts

Hi folks,
First, to say that I am a novice would be an exaggeration of my current abilities. Same goes for Python, that being said:
I am trying to have a legend that goes horizontally across the top of a plot. The legend has 9 labels. Currently what I get is a line fragment on the left and then the label 3/4s of the screen to the right. I think that the legend box autosizes down and I wind up having a legend that coves the top half of the plot and almost the whole width of the plot.
How do I define the legend size, target of 800 X40,and the location of each line and attached label?
Second, what I thought would be an easy fixes to start plotting values at the left edge of the pot, move across the plot area to the right until the right edge is reached at which time a scrollbar would show at the bottom of the plot and the plot would scroll to the left as new values are plotted.
Sounds simple but again, I am very simple in my PyQtGraph and Python skills.

Any help would be most appreciated!
Thanks,
Joe B