couples of problems related to Gauss flow and vector analysis

the surface $ S $ is given by $ r $ (R,$ theta $) = (r $ cos theta $)$ i $+ (r $ sin theta $)$ j+ $ theta k $. (0 <= r <= a, 0 <=$ theta $<=$ frac { pi} {2} $ ) if the vector feild $ A $ is given by $ A $= x$ i $+ y$ j++ zk $,

1. Get the normal unit vector $ n $ of $ S $

2.évaluer $ int_ {S} A $ cdot n $ and $ int_ {S} left ( bigtriangledown times A right) cdot n dS $

I am new in vector analysis, any index would be appreciated.