In interphase, the cell has already copied its DNA, so the chromosomes in the nucleus each consist of two connected copies, called sister chromatids. You can't see the chromosomes very clearly at this point.
The prophase is the first stage of mitosis. The chromosomes start to condense and the mitotic spindle starts to form. The nucleolus, a part of the nucleus where ribosomes are made, disappears. The chromosomes finish condensing, so they are compact. Then the nuclear envelope breaks down, releasing the chromosomes.
In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide. The two kinetochores of each chromosomes should be attached to microtubules from opposite spindle poles.
In anaphase, the sister chromatids separate from each other and are pulled towards opposite ends of the cell. The protein glue that holds the sister chromatids together is broken down, allowing them to separate.
In telophase, the cell is nearly done dividing, and it starts to re-establish its normal structures as cytokinesis takes place. The mitotic spindle is broken down into its building blocks. Two new nuclei form, one for each set of chromosomes. Nuclear membranes and nucleoli reappear.
In cytokinesis, the division of cytoplasm to form two new cells, overlaps with the final stages of mitosis. It may start in either anaphase or telophase, depending on the cell, and finishes shortly after telophase.