ok Its been happening for couple of months and I been ignoring it. When I take off first gear, some kind of knock or pop noise. My uncle said I need a new clutch. I dont know anything about the transmission. I only know the engine and suspension. So does anybody knows this knocing noise???
And if it is the clutch, can I get a aftermarket clutch??

I would look towards your motor mounts. Inspect them all first.