Kemore fridge in dire need!!

My fridge is warm, some days my freezer.Thick coating of ice on the back freezer wall but nothin in freezer freezes. Food goes bad within 2 to 3 days if not kept in freezer. Water is leaking from the freezer down to the fridge. Also there is an odor that comes thru the vents every now and again. What parts do I need to fix this problem. I would purchase a new one but I’m attempting to see if there’s hope for me. Please help!!!

Let me know if you need anything else!!
Nat