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Indoor recommendations for a Bonsai noob
(discuss.tchncs.de)
A place to talk about bonsai plants. Share your bonsais!
Anyone into bonsái will say the same, Bonsái are trees and should be outdoors.
Soo, if you still want to give a try, go for tropical species. Think about plants people usually have indoors, and check if they could be converted into bonsái.
I am actually growing with succes for a pair of years Azalea, Ficus and a Chinese Elm. I would strongly recommend Ficus as your first option.