You sound like you need expert guidance. Get to a gym and ask the bloke behind the desk for advice. Tell them what you're trying to do, and they'll help you work out a routine AND they're also chock-full of great advice about diet. Nobody knows food better than a gym bunny.
Besides like... nutritionists, doctors, any generally educated person that knows the difference between woo and science and well... most people. Aren't gym bunnies usually just desk people? I know some gyms have actual trainers and physiotherapists but.. there is no guarantee what so ever.
Fiddling about with dumbbells is no substitute for a planned workout routine. The good news is, you're on the right track: weight training is the absolute best way to control your weight and get in shape.
While I agree with the first, is there any indication that the OP is "fidling about with dumbbells" ?
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I have better form than 95% of the people in my gym and I just used google, I also managed to figure out that compound > isolated, push and pull, try and achieve balance and remember rest.. all by my self
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
but obviously getting a good program from an educated fitness instructor (which a lot of desk people in gyms aren't) is made of win.
Weight training however isn't at all the best way to control weight or get in shape, weight training is one of several ways to control weight, and to get in shape. What you eat is, by far, most important for controlling weight, and besides weights, cardio is also very important for getting in shape, since cardiovascular health is a much bigger problem in the general population compared to lack-of-muscle and/or CNS fail. Weights are excellent however and can provide some cardio health, just not all cardio health.