I'm not a big fan of tool kits because they force you to pay for a lot of tools that you probably don't need.
In your particular case in point, you'll be pleasantly surprised at how far a set of metric allen wrenches will carry you.
You'll probably need a chain tool, cassette tool, and chain whip. At some point you will probably want to obtain cone wrenches that fit your hubs and a spoke wrench that fits your wheels.
You may choose to have a shop remove and reinstall your headset and bottom bracket for about the same money (or less) as the tools might cost.
That'll pretty much handle the basics. Anything else I'd just invest in as it became needed.