I Have A Black And Decker Storage Shed(purchased At Lowes Where Can I Find Parts Such As Door Hinge (Stud For Top Of Door)?

Almost all hardware shops can get you some form of replacement parts, unless you are specifically looking for B&D parts. Even so, your neighbourhood hardware place might be able to bring in some for you if you don't want to go back to B&D. Have a look and see if your shed is under warranty or not and determine if the parts that need replacing are due to a defect. You might even get them to replace the whole thing for you if so.