Consider what one person can accomplish musically on a MacBook alone. With a DAW (digital audio workstation) like Ableton Live or Logic Pro, a few royalty-free sample packs, some cheap-to-free VSTs/plugins, and a bit of a musical ear, the “bedroom producer” now has all the ingredients she needs to create commercially viable music.
Get something loud that can take a beating. Beyond that, punk amps should be able to handle a sound somewhere between classic rock and metal. The amp will live and die by how it produces overdrive, but you’ll need a more rounded sound that doesn’t have as much high end as well. If you buy something with multiple smaller speakers, you’ll be able to keep your high end definition without cranking the EQ to compensate.