What else should I be doing to get the results I want?

I have been steadily working out 5-7 months now and have lost about 70 pounds now im at a stage where i want to tone up. I have been recommended that I should look into "Whey powder protein" but i dont know if I really want to go that route, Im not sure of any side effects it may have. And suggestions on how to tone up my chest area would be helpful, maybe even diet ideas? Thanks in advance