I have constructed a molding bench according to the Gingery book which should hold about 200 pounds of sand.  Its pretty much covered with stuff right now but ready to go when I need it.

I intend to use petro-bond molding sand for several reasons.  First, I used it in school and am therefore familiar with it.  Second, unlike green sand I won't need to retemper it every time I want to make a mold since there is no water to evaporate.  And third, it is easy to take care of.  After removing a casting from a mold, just scrape off the sand that was in contact with the casting.  You can recycle this burned sand but the waste is small enough that you don't necessarily need to.

My supply of molding sand/furnace refractory.