I went through the same ordeal. Instead of repeating everything that's been said I tried to plan ahead and buy the tools for the jobs I knew I was going to do so I didn't have to wait long to have them available (i.e. 15mm pedal wrench to replace the cheap stock pedals that come on the bike; a torque wrench for carbon fiber). That may not matter if you have a LBS nearby with everything you need.

If you got the itch to buy stuff, get things you'll need down the road like a chain wear indicator or a valve core tool (for tubeless)...once you start using this stuff you'll find out things like, "Crap! My chain wear indicator doesn't show 0.5% wear" so you'll have to go out and buy another one.