Get the sound
Tony Iommi played a Gibson SG through a Laney LA100BL amp on
Warpigs, so you’ll need a Britishstyle valve amp (or a digital emulation) and a guitar equipped with a bridge-position humbucker to get an authentic tone.
Keep the midrange low and the treble reasonably high to get close to Tony’s sound. If you’re playing a Stratocaster or similar single coil-equipped guitar, dial in more bass and less treble on your amp and experiment with more gain.