a Drug test can detect drugs in your system after some days to weeks, depending on the drug used, frequency of use, specimen, test type, metabolism ...

usually it take an averaged weight person 30 day to be clean of thc

drink alot of water, and cranberry juice, and if you pee in a cup after you pee put a like a tiny bit of water in it.
and it will help if you are smaller and have a fast metabolism.

Well that depends on how muh of it you smoked and the quality of the weed. I would suggest drinking lots and lots and lots of water to start. And you an get some clear test from clear test.com if you decide to smoke again. Its pricey but I trust nothing else. Because your system is virgin though I believe you body will flush it out pretty quick if you drink the water!

well drink alot of water and work out as much as you perspire it will help you out. just drink 5 glass of water then start running slowly for an half an hour, then drink another 5 and than again start running it will increase metabolism.