After you get the tumbler and pins -
Armor All Wash 'n' Wax. The wax coating will keep the brass nice 'n' shiny for much longer. This doesn't cost much more than dish detergent.
LemiShine helps clean up corrosion. I use 1/4 teaspoon per batch. This is one case where more <> better.
Seperating the media can be a pain. I'm pretty happy with the Frankford Arsenal Media Seperator (don't get the cheaper bucket based one - the pins fly out the top)
Cheap dehydrator of your choosing to dry it out.