You're post stinks of a failure to understand how hard "bulking up" and losing fat is.

Ideally you need a gym and 6 meals a day totalling circa 3000calories if you want to put on good mass.

Staple foods such as; chicken, eggs, fish, red meat, rice, cous cous, oats, cottage cheese.

With a set of dumbells i doubt they will do much at all. Plus - train legs. Even if you use dumbells you can still do squats and lunges.

Training legs releases natural growth hormones which spurs the rest of the body to grow blah blah blah, i get the feeling im wasting my time even writing this post though.....