The Number One piece of equipment you need to buy is a good protein skimmer. A skimmer will remove organic debris before they decay and impinge on your water quality, which in a 10-gallon tank with such a small volume of water, could spell doom in a big hurry. A good skimmer also raises the dissolved Oxygen levels in your tank, to the benefit of the life within.
You could use live rock and live sand for your filtration; a 10 is small enough to use just that. The HOB
filters mentioned could be used for floating debris removal and current. Stay away from the bio wheels. The bacteria in the Oxygen-rich air/water interface on the spinning wheel are so efficient at turning Ammonia in to Nitrite then to their 'waste' product Nitrate that people who use them almost always have higher levels of Nitrate in the water than those without biowheels.
Also, you need to have the waterfall of the HOB
filter low enough where it doesn't splash, or you'll end up with crusty salt spray all over the back of your tank.
I've known many people who have little reefs your size, so there's no reason you can't do it, if you are properly equipped and educated on the subject.