Hi BabySteps and welcome to LWL!
You'll find lots of opinions on this but I've often read that we need a gram of protein per pound of lean body mass. (You have to know your body fat % to be able to do it this way.) If you don't know what your LBM is, I think it would be reasonable to base it on your goal weight.
If you're "very overweight", eating a gram per pound of body weight would sure be a lot of calories and might make it difficult to reduce your calories enough to be able to lose fat.
Tell us some more about you and what kind of plan you're following.
Meg