first time trying alternate day fasting, any tips?

For reference I’m 5’3 and 170lbs and the heaviest i’ve ever been after having a baby and i just cannot shift the weight because once I start eating I find it impossible to stop! I stalked this sub a little and found that a lot of you so alternate day fasting so I thought I could give that a go before I attempt something like a 3 day fast! do you guys have any tips? I just started the fast now after having pizza (lmao i knowwww) but i am determined to do it! My goal is 120lbs