For the P53 Enfield cartridge, there is no better place to look than Research Press:
http://www.researchpress.co.uk/firearms/british/enfield/cartridge.htm
Follow all of the links at the bottom of the page and it will take you through an accurate description of all phases of the process. You will be particularly interested in the one entitled "Cartridge Manufacture". "Loading" will also be interesting.
Remember that the rifle musket cartridge as loaded in England was different from that made for the US and CS forces, especially the orientation of the bullet in relation to the powder. The British cartridge was loaded WITH the paper still wrapped around the bullet, the American bullet was loaded without the paper.
This site may help a little but it refers to loading blanks for reenacting:
http://www.lazyjacks.org.uk/cartrdge.htm
Authentic bulleted cartridges of the American style, round ball or Minié, can be made using the info at the Lazy Jacks website above.