Depending on what your interest in theater is, I always recommend working on plays. It's a great way to be introduced to the field, and also a great way to be seen by agents and representation. I'm also a great advocate for studying acting at a drama school or a college.
Going from sharing a one-bedroom place to living in a loft to two people living in a house to me having my own place by myself has kind of mirrored my career... small steps to bigger, to bigger, to now having a steady job.