Lowes, Home Depot, etc, usually carry the Smith Tri-Hone stones, with oil and a plastic guide, $25.
Flea markets and gun shows always, since the beginning of time, carry P.O.S. Pakistani folders. Crude and ugly, the true blademaster stays far away from these. Get 2 or 3, in different shapes and sizes.
Now practice. They will have no edge to begin with. If you manage to sharpen one, the junk steel won't keep the edge beyond opening your bills. Re-sharpen. Do it wrong, scuff it up, doesn't matter.
When you can put an edge on these consistently, you will have learned.