1. Filming manually is always best, even if you're doing followcams. If you really want to shoot on auto, make sure the light won't change. A changing exposure within a shot is one of the most telltale signs of an amateur. But if you're manually adjusting settings, make sure you change them whenever the light changes.
2. I don't know much about the hv30, but it doesn't matter what order you do those things in. Just think, do I want deep depth of field or shallow depth of field? If you want shallow, set a low aperture. If you want deep, set a high aperture. Do you want motion blur or not? If you do, set a low shutter speed. If you don't, set a high shutter speed. Sometimes you'll want a shallow depth of field and motion blur, but it's too bright out. So you will have to compromise by either deepening depth of field or turning shutter speed up. But the point I'm trying to make is that the order doesn't really matter; there's a number of factors that will determine shutter speed and aperture.
White balancing makes sure your colors are correct, it's unrelated to shutter speed & aperture because it doesn't affect how much light hits your sensor. You just want to do that whenever the light changes because things take on different colors (cool colors in the shadows, warm colors in the sun).
3. 60p is probably the ideal frame rate. Since you're on the hv30, you will probably want to do 60i for slow motion, even though that's not ideal. If you know you're not going to do slow motion, I like 24p. it has a nice film aesthetic. But another option is to shoot everything at something like 60i and conform it to 24p (I believe you can do this but i'm not 100% sure, I've never dealt with conforming before editing).