I toured with an 'industry' band for a while and I had very little idea where the money actually came from. We had studio time, car service, hotels, plane flights, gear waiting for us at the gig, etc and I never touched a dime in the process. Artist management handled all of that for my (somewhat established movie star playing the rock side-dream who's name I won't disclose) lead guy and us, his 3 band mates and engineer/soundguy/producer. I never saw a single transaction or contract I was just along for the ride, if I needed cash I just told my 'assistant' (who was also responsible for making sure I was on the plane on time or getting guitar strings or whatever and probably got paid more than I did). I guess what the experience of an 'industry' gig is. I kind of hated it it being so out of my decision making, but hey it was a great opportunity to travel and rock and live the good life on someone else's dime.
Back down to earth though, in all my DIY bands, we would... well... not pay rent and either live with girlfriends or parents or (for a while with one of my more successful projects) in a campsite under a bridge with tribes of squatters while not touring, or sleeping in the old ambulance we used as a band and spent all the extra money on getting us to the next show, beer, cigs, eat for free at the bar.
I think it's best to work with other bands when doing this approach. If you are buds with guys in other bands who can spit the bill for rental gear, take turns doing
the Tshirt/CD table for the other band, or doing sound, or share a mutual bandwagon for transit. If you have several gigs booked in places spread out within a days driving distance from each other (we used to go down and up the west coast for instance, starting seattle, then portland, then san fran then LA, then back up and this was with my broke homeless band and out suburbanite buddies 'sister' band. We would be on the road for 2 weeks tops and play almost every night as long as we booked in advance and brought some sale-ables with us. We would do this every 2 or 3 months and lived off of it (due to not paying rent for anything but our practice space and studio) for almost 3 years.
just some thoughts based on my own experience. Take it or leave it. It's not an easy job, so either get nice girlfriend, be blessed with rich parents, or be prepared to scum it.