As a starting point, you may see the following references. The first reference contains links to a number of online tools for sample size calculation. You can also use G*power software as available free of cost (follow the link provided).
Charan, J., & Biswas, T. (2013). How to calculate sample size for different study designs in medical research?. Indian journal of psychological medicine, 35(2), 121.
VanVoorhis, C. R. W., & Morgan, B. L. (2007). Understanding power and rules of thumb for determining sample sizes. Tutorials in Quantitative Methods for Psychology, 3(2), 43-50.
VanVoorhis, C. W., & Morgan, B. L. (2001). Statistical rules of thumb: What we don’t want to forget about sample sizes. Psi Chi Journal, 6(4), 1-3.