Creating the buttons is easy - just select the style you want from the Boolean palette. What you need to do is change your diagram and the VI properties. To have a VI automatically start running when opened, open VI Properties by selecting that under the File menu or right clicking the VI's icon. Select Execution and check the Run when opened box. If you need the user to enter some data or change parameters before running the program, there's a couple of ways to go about it with a front panel Start button. You could have a separate while loop with just the start button in it and connect an output of that to a main while loop. This creates data flow and ensures that the start while loop executes before the main. You could create a simple state machine. T
here's a couple of shipping examples. Just open the Example Finder and enter state for the keyword. You could also use the Event structure. Again, there are several shipping examples. Instead of doing a search, you could also browse the Example Finder and look at what's underneath the Building User Interfaces topic.
p.s. I don't think you created a stop button for a for loop as there is no way to stop a for loop. What you can stop is a while loop.