strength is away and im very weak in gym

[dmax]

im lifting nothing for a big guy my size, i went to gym this morn and pressed 20 kilo bench press , a joke, my strength is away , i didnt eat before i went, i want to know what to eat before gym and how can i build my muscles and gain strength, was taking creatine before , can creatine put weight on me ? i dont want weight on and i dont want my appetite going throo roof either . what about protein drinks ? advise please