I would suggest looking in the real results section and reading through the articles and routines in there. There are loads of 3 days per week ones and they will give great results. Once you have decided on one, or there are some you like the look of then post them up and we can perhaps see if they are gonna be right for you, your goals and the equipment you have available.
Also dont forget that the most important thing you need to do is eat, you are probably not eating anywhere near enough. if you want some pointers ondiet too then post up what you are doing at the minute and we can look at that for you too.
Once you have a diet and routine sorted, start a workout journal/log and we can help you along the way if you want us to.