If your oven is self cleaning then all you have to do is the prep work and then a simple wipe down afterwards.
If your oven is not self cleaning then you will have to do a bit more of scrubbing.
Begin by removing all the racks and washing these first with warm soapy water.
Rinse well and allow to dry. Then sprinkle a bit of baking soda inside the oven and spray with a small amount of white distilled vinegar. Be careful as the vinegar will fizz when mixed with baking soda. Allow to sit a while and then wipe well. Scrub any areas that are heavily soiled. Be sure to rinse well. If any residue remains, spray with some more white distilled white vinegar and wipe well.
Then be sure to read my tip on "Keeping your oven clean."