Spark plugs require nothing special...just a standard spark plug socket, and wrench. If you don't have one, and don't want to buy one, there should be one in your BMW tool kit in the trunk.
Coolant is really simple...like changing the oil. Drain, refill. If you are planning on doing the block too, then you will need to bleed the air out after yoiu refill. The shop manual should say exactly where the bleeder screw is.
If you want to flush the coolant system, then you will most likely have to bring it to a shop, they have special machines that run chemicals through the entire system to flush it out.
Brakes, time consuming, but easy. All you need is an alan key (as Tony said) and a socket set. And preferably a torque wrench, unless you are good at guessing tightning torques.
oh, and invest in some anti-seize paste, you will thank yourself for using it the next time you do the brakes.
If you don't have a socket set, I suggest you splurge and get one.