Updating a kitchen can be done in several ways. If the cabinets are in good condition, new countertops can change the look of that room, new appliances etc. If the face front doors and drawers are real bad you can do new doors and refinish the exposed wood boxes behind the doors and drawers. Those would be the most economical way to update a kitchen, without going all new cabinets. new flooring can be another option with a totally new paint job on the walls. Best way to start is to visit your local home center and get a plan put in place.
Hope this helps, Andy Love