Weight loss is about a calorie deficit. MANY ways to go about that. Diet, exercise, diet AND exercise, etc. So whichever way you eventually choose, you should start with the math. To make it super easy, find an on-line calorie calculator to figure out how many calories it takes for your body to maintain the weight it is now. Plug in the information (age, gender, weight, height, activity level...) & it will do the math for you. It should tell you how many calories it takes to maintain the weight you are currently at; how many calories for weight loss.
Yes, there's more to it - the weight didn't come on overnight, it won't come off overnight. But ^^THAT^^ is where you START.
You are here! - that's a good start, too.

Come here often! Lots of tips, good advice, and great support here.