I'm all for buying tools as needed for starters you should get a good set of metric wrenches 8mm to 17mm fairly cheap at auto or hardware stores, a good larger size adjustable wrench and a set of metric allen keys. I also highy recomend that you get a couple of basic cone wrenches like these.
http://www.ebay.com/itm/2-Piece-Bicy...item483ec6e39c