Not to discourage you, but they’re awfully light for vertical jigging if that’s what you have in mind. I made a few, and they just don’t sink fast enough. Very easy to drill, stuck them in a vise and use any metal bit.
If you want to make vertical jigs, clone a few you like in bondo casts and just melt some scrap lead in an old cast iron skillet. I’ve done this is the past with success.
Keep it up that's how you learn. Use a drill press, makes drilling easier piece of scrap wood under the metal is better on the bitt when drilling. Drill slow be careful when bitt breaks through it has a tendancy to grab the metal.
Table knives are usually low-end stainless. Any drill bit would work, it will depend on how many you are planning to drill? 5-20? Probably cheap out with just a black oxide bit. 20-50? Cobalt. 50+? Coated (TiAlN) Carbide.