>>1962178just get a set of metric allen wrenches (ball-end are nice to have), a chain breaker and a chain checker, a decent floor pump with a gauge, and tire levers and a patch kit to start.
buy whatever else specific to your bike as you need it. a kit will either come with extra stuff for standards not on your bike, or will have the wrong standard for what you have.
park, pedros, and icetoolz are good brands.
if you don't have general purpose tools at home, you need screwdrivers, wrenches and general purpose stuff anyway, just get a reasonably priced basics set from whichever big box hardware store is closest to you. be wary of super cheap sets online .
if you have carbon fiber frame or components, you need a torque wrench. don't buy the absolute cheapest but you don't need to get top of the line either
go to the auto store and get an oil can with a pump on the handle and a long flexible nozzle. they're pretty cheap. fill it with whatever motor oil is on sale. use this to lube all the moving parts on your components and wipe off the excess with a rag. may as well get a tub of grease if you want; doing your bearings is a little more than entry level maintenance but you are going to use it eventually. you don't need anything special, just wheel bearing grease or whatever.
buy some bike-specific chain lube. or make about a lifetime supply out of mineral spirits/kerosene/lamp oil and a quart of chainsaw bar oil. it'll cost about $15 total, the recipe is on
bikegremlin.com 
