First of all I would recommend you upgrade your tank size. A 3 gallon is certainly not ideal for a beginner. I would look into upgrading to something like a 29 gallon in order to make your life easier. The larger the water volume, the greater the stability.
In terms of feeding, the real trick with a tank so tiny will be preventing ammonia spikes from overfeeding which in such a small volume will become toxic very quickly. I'd opt for a small skimmer as some are coming out on the market now that would work in your system. You could also DIY one if you're handy with acrylic.
Another option would be to tun it as an eco reef, doing 100% water changes every week. However, this would not be ideal for fish but since your tank is essentially too small for anything but the smalles of shrimp gobies or coral gobies this shouldn't be a problem.
Here is a link explaining the EcoReef philosophy: Feature Aquarium: EcoReef One: A New Kind of Nano Reef ? Advanced Aquarist | Aquarist Magazine and Blog
On the issue of clownfish, I would not put any freeswimming fish in this tank, only perching type fishes.
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