Personnaly, I would start w/ the misfire as it's the easiest. Probably just needs a new set of Autolite copper plugs (606's) and wires. You can get those for about $60 or so total for both. Maybe cheaper if you don't get the lifetime wires. Heck, I've got my old NGK plugs here if you really need some. Cleaned and regapped they would get you by.
The cam sensor code would be next on my list. May also want to just check out the wire harness connection to it and see if it's clean and tight. If not, clean it up and see if the code stays gone.
The whining noise could be one of the 4 kids, lol... Anyway, I'd check the power steering fluid level. It's in a stupid spot that you cannot see. It's under the alternator. Just reach down between the firewall and alt and you should be able to unscrew it and check the level. You will need a long funnel to fill as needed. The other thing that can cause a whine is the trans. Check the fluid level while it is fully hot, in park and idling. If low add slowly until its full. Use Dex III. Worst case drop the pan and change the filter and fluid, about 7 quarts.
I'd start a new if you still have issues since it will get more visability, and welcome to the site!
