If the cabinets are wood sand them, using a damp rag wipe them down and let them dry very well, prime, paint and seal. If you are going to do all the work why not add new hardware or paint your current hardware for a completely new look?
Do you want to paint or refinish the wood? This article is a general outline of both processes so it should give you some idea of what needs to be done. Wishing you the best.
Hmmm! What type of finish? Stain, paint, ?
Here is how we painted ours: https://thehoneycombhome.com/painting-kitchen-cabinets/
I used General Finishes’ milk paint on mine. It was easy to use and required minimal prep work and very little hand sanding. I love the results! You can see my cabinets and how I painted them here: http://momhomeguide.com/my-painted-kitchen-cabinets-a-year-later/