How much calcium do I need and where do I get it?

Depends. Calcium requirement depends on your age and sex. You can look it up at nih.Gov. If you do not get in enough from diet or supplements, your body will take it from your bones. The body requires the blood calcium level to be normal for proper muscle, brain and cell function.
Calcium suplements. If you are trying to just suppliment you calcium intake 1500 mg daily is reccomended. Can be obtained via calcium vitamins in the store shelves such as oscal or you can use Tums (calcium carbonate) which has 500 mg calcium per tum.