Once you have the negative you use an enlarger to create your prints. An enlarger has a head containing a bulb, a negative holder and a lens. The head is on a column attached to a base. You can raise the head away from the base to make the image larger (or turn the head to project the image onto a wall for large prints)

If you want to do a contact sheet, you cut your negative into strips to match the size of your paper, and lay them on top of the photographic paper (in contact with the paper, hence "contact sheet"). You put a piece of glass over the top to keep the negatives flat and in place. You turn on the enlarger bulb to expose the paper, and then develop it with a similar mix of chemicals you used for the negatives (developer, stop bath and fixer)

Once you have your contact sheet to review, and decide to make a full sized print. You load a negative strip into the holder in the enlarger. You turn on the bulb and focus the image onto an empty easel (which holds the paper in place). Once focused, turn off the enlarger, and load the paper into the easel. Then you turn on the bulb once again to expose. Usually the enlarger is connected to a timer.

To get the correct exposure takes some trial and error. Generally you cut up strips of paper (so as not to waste entire sheets) and use these as test strips. You cover most of the strip up with your hand or a piece of cardboard. You expose for say a total of 60 seconds - every 10 seconds you uncover a bit more of the strip, so that when you are done, you have sections that have been exposed for 10, 20, 30, 40, 50 and the full 60 seconds. You can then develop and view the test strip in full light to judge what the correct exposure should be. Then you put in your 8x10 paper and expose for that amount of time.