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Will my readers expecting to see business news get disappointed by reading regular sales reviews?
well written sales reviews that are related to whatever business topic you have on that blog should never a disappointment. bad unrelated sales pitches would be.
ive only recently started with affiliate sales and one thing that helped immensely is seeing what's on offer, once you have a CJ account. without seeing the advertisers its all a bit vague but once you see the actual products and the commission you get, it becomes much easier to get ideas.
for your webdesign site, an obvious affiliate choice would be hosting companies but afaik there is quite a bit of competition there already.
note that im no expert!