Eating right should also be high on your list if you're going to start lifting weights. If you're skinny like you say, simply lifting a few dumbbells from time to time wont 'beef' you up. Along with the right diet, work out plan and commitment, you need to study and research form, technique and breathing to lifting weights; im assuming you're a beginner.
If you're too lazy to go to the gym, i'd say you're half way to quitting and aren't really serious as it is.
Check out the app 'fitness buddy' if you still insist on doing your work outs at home. This app has hundreds of exercises for you to do with dumbbells, barbells, body weight etc.... targetting any specific muscle group you want.
That's not really fair.