Autozone and wal-mart (don't you dare shop at wal-mart

) should both carry the catch can that can be sealed up for transportation to proper dumping sites. I have a couple that hold 15 quarts each.
For coolant, 2 gallons if I recall correctly (I'm assuming this is for your wife's car, not your new one). I recommend the Prestone (think that's the company) animal-safe coolant in the white bottle. I don't think it comes pre-mixed though, so just buy a gallon of the concentrate (about 10 dollars I think). Gear oil seems to be between 2 and 3 quarts, and I gotta say I've been incredibly happy with the Royal Purple "max gear" 75w90 synthetic* gear oil that I'm currently using. I've also had good luck with the Redline MT90 synthetic gear oil, and in a pinch (i.e. when I arrived at the headlight painting meet with no gear oil in my car at all

) I've used the Mobil1 (I'm going to hell for buying ExxonMobil products

) 75w90 and it seemed just fine too.
*no Royal Purple product is a true synthetic made from PAO base stock, it's hydrocracked molecularly modified dino base stock. Hence I now swear by Redline oils. In theory, Mobil1 is still a true PAO synthetic although with it's relatively low pricing compared to Redline, people have suspected that it no longer is (no proof of this). Amsoil is another brand that offers a true synthetic, but they also market a hydrocracked oil as "synthetic". One of their lines is called "full synthetic" or "100% synthetic" or something along those lines, it's the real deal PAO one.
As for anything else you might need, if I remember to, I can bring the apparatus I bought in Massachusetts to fill it. It just screws on to the gear oil bottle and gives you an on/off valve and a long hose. It helps
greatly to reduce spillage during the fill. The fill port on the transmission is right on the front, with a placement and angle that makes it impossible to fill without at least a funnel with attached hose (think beer bong.. though I personally have no experience with one of those).