You never filled out your profile, so it is hard to give specific advice for wherer to buy and what brands.
If you are just starting and want to make a knife for fun, get a cheap 1X30 with disc sander on te side from HF or another low-price store. It will work, the belts can be bought at the same store, and it will still have some use later on if you get bigger and better equipment. A grinder with variable speed is preferred.
Also, get some files and a stack of metal working sandpaper.
Most of the basics and needs can be found in this tutorial:
These are the instructions I use to get someone started with a profiled stainless steel knife blank. I send it to new makers when I send them a blade blank and handle kit.
I thought there might be those who could use the tutorial and pointers. Some details are specific to a particular knife project, but the info is universal. You can start with a bar of any type of steel and shape it to the knife profile you want. 1084 is a good starter carbon steel, and CPM-154 is a good starter stainless steel.
Files needed are a 10-12" mill bastard (or a magic-cut), and a 10" second cut...