Using dplyr and ggplot2 for means and standard deviations of subsets

Basic question that maybe will also help others just beginning. I have a large data set with lots of variables arranged in columns. I have made subsets with 8 or 9 column variables each and I want to get just means and standard deviations for each of the subsets columns using dplyr and then with ggplot2 graph each subset on one graph with each individual bar showing the mean for each column with standard deviation shown in handle bars. My goal is to create one graph for each subset as simply and efficiently as possible. Appreciate your help!