>how much pressure?
Like put a little weight into it. Put the drill in low gear. Depends on the size of the bit too, less pressure for smaller bits. Keep it straight too so you don’t snap the bit, especially cobalt bits. But you want to see a steady stream of chips coming off. If you don’t see shavings, you need more weight or a sharper bit and/or more oil, don’t continue drilling with no chips or you’re overheating it. When you get little coils like picrel coming, you got it perfect.