Cycle first. Danios are a great first fish. Zebra danios are especialy nice and the long-fin variety is also attractive. They will school when other fish are around and are very hardy. I'd avoid neons myself, they can be fragile if not kept in very soft, acidic water. Same goes for most other small tetras. They need to be added to an established tank. A 2ft tank sound like maybe it could be 20 gallons?