Shoot, use a first act guitar! Hit up the pawn shops!
The idea is that if you get a very limited instrument to hone your chops on and get good with---you'll find out over the course of learning what the instrument's limitations are and what you wish it could do.
Armed with this knowledge--and with guitar-store ready chops--you'll know exactly what kind of 'pro' guitar you want to get when you upgrade.
Back In Black isn't a song. It's a divine call that gets channeled through five righteous dudes every thousand years or so. That's why dragons and sea monsters don't exist anymore.