What is the best way to gain weight and build muscles (what resistance training do i do)?

Diet + training: Some of the best information on resistance training is from acsm, eg, www.Acsm.Org/docs/current-comments/rtandip.Pdf and http://www.Acsm.Org/access-public-information/articles/2012/02/02/a-strength-training-program-for-your-home in addition, following healthy eating guidelines from the cdc would be helpful http://www.Cdc.Gov/healthyweight/healthy_eating/index.Html.