12 foot is awesome! However, be aware that the longer the background, the more it tends to sag (sorry if that´s the wrong word

) I have used steel tubes to prevent that and also had
this kit from B&H. If you only use it for a short time, that won´t matter much, but in the longrun it will create ugly patterns on your background paper (not that important if you want to shoot on plain white, but for everything else). Keep in mind, that backgrounds are best stored upright for that very reason. If you have the chance to store a shorter one upright, it might be a good idea to reconsider the length.
Also keep in mind that getting the paper back on the roll is not that easy - something like this can be handy:
Manfrotto 046MCG Expan Drive Set with Gray Metal Chain 046MCG
If you have the opportunity to put it on a wall instead of on a stand, look at these:
Manfrotto 045 Background Triple Hooks for Three Backgrounds 045 That would be cheaper and better!!!
If a wall is not an option, maybe this is interesting:
Impact Deluxe Varipole Support System (Silver) BGSS-VK3S B&H I love these autopoles - can´t tell you anything about the quality of the varidrive though - the heavier the background, the better the chain has to be.
Just a few thoughts