For question 1 please see the FAQ post;
For question 2, you can use one of the many BMR+exercise calculators like this one, then consume about 10% less than what it says. This is all rather approximate though, its really hard to work out how many calories you use. In the end you will just need to consume a measured amount and keep weighing yourself for a fortnight or so. Adjust consumption according to results.
As for how many calories are in a scoop, it varies depending on what type your eating, but its on the label.