Question

how observe cell from the first time and when

Answer 1

The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope

Answer 2

cell was observed by robert Hooke in 1665 , in the bark of tree that is cork. he has observed dead cells which look like honeycombs.
if u have to observe cell take microscope slide saffranin onion peel ( full details are available on net) prepare the slide any observe under microscope. make sure air bubbles are not present in it.