Help!! Please??

hello this is my first grow and im quite frankly FAILING ... In the last 2-3 weeks my plants have been infected with some brown mouldly marks before drying up and fallin off.. i removed several infected leaves to stop it spreadin seems to have done the job (will this have worked or am i jus prolongin the death of my plant???)There missing alot of leaves will this affects my harvest much?? i have started flowering them yesterday tho only 4 plants for a 600w bulb, ... Can any one recomend a nutrient that wont cost a fortune??

pictures help, mold is from high humidity if that's what it is

post some pics, u cant post a pic with a question like this and expect everyone to just go off your description, not tryna be rude, just honest...

yes mate u shouldnt go into flower with hardly any leaves. your plant relys on your leaves to make the flowers"BUD".if u want a good nutrient that doesnt cost much goto your nearest garden store. but if your hydro goto your hydro store.as for you brown spots we will need photos