Basically im not going to make you guess

Im 6ft 4in
I weigh about 20st / 280lbs
iv been training on and off for the last few years
i eat fairly sensible for what i weigh
not sure on my bmi

iv just taken a membership out at the gym and the first thing i want to know , is there different kind of steroids to help lose weight but gain muscle or will it all help , all help is highly appreciated , thank you