I want to go on a diet plan

Alexandria • ~👶Rainbow baby 10/21👶~ - Happily married 💑💕 3/29/15
I need advice I want to go on a dietamd drink thise slim fast shakes. I work at cracker barrel and most of the tine I eat there. Idk if I should just restrict myself to just salads and water and usually I just make like tacos and stuff at home simple stuff but I need help...I don't know how to start a diet plan....any advice please what do you do????