Welcome to WebmasterWorld, kdollar!
A couple of quick comments on your questions:
* A "good" CTR is really defined by each advertiser, according to their particular measures for success. But I'd say that the average CTR is probably slightly above 2.0%
* A high CTR is to your advantage, in that it will help your ad show higher on the page for less money. On the other hand, it's not the only measure of success. Also be sure to track your ROI (Return on Investment) as closely as you're able. You'll find lots of advice on this topic in earlier threads on this Forum.
* To know your ad's position, on average, over time, just use your account statistics. You'll see a column in your statistics for Average Position, along with a date range tool that allows you to look at different time frames.
* Remember that your Average Position is also an average over all countries or regions in which your ad appears. So your actual postion in a given moment may be higher in one country or region than in another. But your account statistics are an excellent way to know what your position has actually been, on average, and over time.