Oh, Drole...I am the Queen of getting rid of everything for a move! When I moved to Baltimore, we took nothing but our clothes because we got all new furniture! Start putting up flyers around school to see if any of the students would want some of you old furniture. Since you aren't using movers, you can't pawn off your furniture on them. I've had movers take coaches with stuffing pouring out the sides! Anyway, Good Will will take the other stuff, but you have to call and make an appointment for them to pick it up, so plan ahead.
I don't know where you live, but if you are in a suburban area, putting stuff on the curb is also a surefire way to make things disappear.
Moving boxes can be expensive. Try going to grocery stores and pulling behind the stores to the dumpster areas. When the stores get shipments, they will dump the boxes out back. I was lucky working in a hospital that I got to do this with the Pharmacy instead. You may be able to go inside and ask them for boxes and see what is the best time to come by to get them before they get nasty.
Everytime I move (which is frequent), I wish I had thrown away more. I disagree with 33girl's advice. Really consider if you have worn something and will ever use it again before packing it in a box. With this last move, I wanted to cry when the movers left, and I surveyed the mound of boxes in my kitchen. I survived, but next time will be different!