Does anyone know if placing an Amazon store on my site for Pilates related books, dvds and Yoga products would hurt my SBI site? I have not read anything about this 'yet'.
It can help you make more money as long as you have an abundance of good content. Ken recommends you have at least 30 pages before you start monetizing though. Other than that, it's great way to make money, especially if you use and review the products you promote.
Now when you say "store" I'm assuming you mean a collection of products related to one topic that Amazon calls a "store" but you simply just add the code to your site and it populates the products you want?
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Don't put the cart before the horse. Plan your website, thencreate it.
Yeah following on from what lisa said, if you don't have a reliable content based site people will in trut not trust you and have you down as a reputable trader, keep that credibility going and have some useful reliable content and people will begin to love you.
Then you could add some checkouts, Amazon related software. I think you can promote products also just like ads, It changed name recently.