Reddit mentions of Cheaplights 6 PCS 3.75" Spring Clamps

This is the one I picked up. - http://www.amazon.com/gp/product/B003UOOTCS/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Probably more than you need, but I've been thrilled with the value considering I use it for youtube videos, site commercials, and of course, now Twitch.

You could probably just get away with this - http://www.amazon.com/6x9-Chromakey-Backdrop-Background-Fancierstudio/dp/B001PCQTDO/ref=pd_cp_p_3

Make sure you have something to set it up with, either a wall, piece of foamboard, or get a frame like this - http://www.amazon.com/LimoStudio-Adjustable-Background-Backdrop-Support/dp/B00E6GRHBO/ref=pd_bxgy_p_text_y

If you get the frame, don't neglect the spring clamps - http://www.amazon.com/Cheaplights-PCS-3-75-Spring-Clamps/dp/B0019SHZU0/ref=pd_bxgy_p_text_z though I got mine (metal and more robust) from Home Depot.

heres two of the biggest, Duct tape, and crazy glue. trust me.
on a less personal experience note, id recommend extra cables as many as you can carry, or a cable kit if you make your own. any adaptors in bulk you may use and store them in two separate places. when stuff goes missing its great to have a backup box of emergency stuff. actually id recommend also if you are planning any outdoor gigs, plastic drop cloths and larger golf umbrellas if you have room.

Edit* oh a just remembered, these little beauties saved me a hew times as a sound tech. https://www.amazon.com/Cheaplights-PCS-3-75-Spring-Clamps/dp/B0019SHZU0