Haha, your wife's medical costs? Don't you think wasting your money on ppc without having a CLUE! is a good idea? (I am not pissed because you're a newb but because you're trying to bullshit us, or are indeed an idiot for doing that)
Tricky trick to ppc is: test, adjust, retest, repeat till you hit profit.
If you set up your campaign alright and show sth like -30% profit, then continue, if you are out of a 100% profit then just dump the campaign and try sth different.
Get markets where people want to buy stuff not where people are interested in free stuff.
Get markets where people want to buy expensive stuff(Cameras, Eletronics) cause amazon comission sucks.
Get a redirect for your amazon products cause direct links look ugly
Find sth that's hot right now (seen on the news or whatever) and just recently got lots of search volume, (for instant a CNN report on the new Hair removal thingy) go, find some keywords, shoot up a a campaign with a few hundred keywords connected to the main one
you will get cheap clicks cause no established publishers are advertising on thoose keywords and voila you at least got cheap clicks
If you're really interested in ppc, go and read up on it. Else I suggest not waisting your wife's lung with this.