Blizzard Beast,
While everyone is trying to advise you to get a bigger and better grinder, your initial question was about a budget entry.
We all love our nice equipment and want everyone to have the same level of gear. But that is not always the financial reality for new makers.
Others, Like David Mary are experienced makers and can do many things you can't (yet).
The simple answer is a budget priced 2"X36/42/48 or whatever size is available for a low price will get you started. 1" is not nearly as desirable as 2".
You only need belts to grind away the excess metal to make a knife shape. 100-200-400 ( or something like that) is all you would need to start.
A good magic-cut file will remove a lot of steel. Files are a great way to get started. Even with a shop full of grinders, most of us use files regularly.
Wet-or-dry sandpaper is what you want for final finishing. 200-400-800 is enough for most knives. When you are ready for finer finishes, there are papers up to 12,000 grit available.
One big piece of advice is to not move to a finer grit until all the scratches from the last grit are gone.
The other advice is have fun and take your time.