[Routine Help] Vitamin C Serum and Niacinamide Cleansers?

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Hello SCA. Thanks for all the great resources and product recommendations. Unfortunately, I bought a vitamin C serum (http://www.ulta.com/vitamin-c-serum?productId=xlsImpprod6200689) and a cleanser with niacinamide (http://www.ulta.com/foaming-facial-cleanser?productId=xlsImpprod5140065). I've read that for maximum benefits you should use vitamin C in the morning and evening which I may do once I ensure that this doesn't break me out.During a spot test on my chin yesterday the serum seemed fine, but when I put it on half of my face after cleansing this morning it turned a little red and then returned to normal. Is that a reaction with the Niacinamide?I guess my questions are 1) Can these two products be combined? 2) If yes, what wait time should I use? 3) How often should you actually use a vitamin C serum because I've heard every couple of days and twice a day and I'm not sure which direction to go in?
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