my first printer

I just got my first printer and I am having lots of problems . my printer is a rostok 3d printer . I downloaded repetier host and arduino . I cant calibrate it . every time I hit home it bangs into the top and keeps going for about 6 - 8 seconds end stops are installed and every time I make a change in repetier like height it wont transfer to the printer can you help a first timer please    


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